Reference Library

Summary

This library helps you make original games in Unreal Engine 5 and Construct 3 without starting from zero. Each entry is a game or asset pack you can study (read how it works) or, if the license allows, build on.

Nothing is cloned or shipped. Licenses marked Verified had their license text read. Asset licenses are checked less closely than code licenses, so check art and audio before shipping anything.

185licenses verified
50with a license problem
72shown but not yet verified
1032in the full data file

Cut for readability: this page shows 257 of 1032 entries. The full data (every entry, filtered-out ones included) is in all-candidates.json next to this file, and copies of earlier versions are saved as Reference Library (backup before cleanup).html and Reference Library (backup before batch 2).html.

Start here: top picks

The best-scoring verified entry in each genre. All have a permissive code license, verified. Asset terms still need a look before shipping.

Claude-of-Duty (opens in a new tab) 3D shooter · MIT · port confidence 88%
MIT (LICENSE). README says every texture, mesh and sound is generated. Uses the Call of Duty name/theme: rename before shipping.
SDLShooter (opens in a new tab) 2D shooter · CC0-1.0 · port confidence 90%
CC0-1.0 (LICENSE). Code license confirmed; asset provenance not audited.
poke-survivors (opens in a new tab) Top-down shooter · MIT · port confidence 88%
MIT (LICENSE). Code license confirmed; asset provenance not audited.
LambdaHack (opens in a new tab) Roguelike · BSD-3-Clause · port confidence 90%
BSD-3-Clause (LICENSE). Code license confirmed; asset provenance not audited.
SunnyLand (opens in a new tab) Platformer · CC0-1.0 · port confidence 88%
CC0-1.0 (LICENSE). Code license confirmed; asset provenance not audited.
Cats-Godot4-Modular-Souls-like-Template (opens in a new tab) Action RPG · Unlicense · port confidence 85%
Unlicense (LICENSE). Code license confirmed; asset provenance not audited.
raylib-games (opens in a new tab) Engine / starter kit · zlib · port confidence 92%
zlib (LICENSE). Code license confirmed; asset provenance not audited.
Midless (opens in a new tab) Sandbox · MIT · port confidence 92%
MIT (LICENSE). Code license confirmed; asset provenance not audited.

Library

slaytheweb (opens in a new tab)

Verified Roguelike Study

Code license: AGPL-3.0
Asset license: Artwork from public-domain old-book sources, game-icons.net (CC BY 3.0) and RPGUI; typeface commercially licensed from mbtype.com (swap it).
Engine / build: Custom (JS) / npm
Browser-port confidence: 98% (checked)
Last activity: 2026-05-29

AGPL-3.0 confirmed; art comes from public-domain old-book prints, game-icons (CC BY 3.0) and RPGUI, but the typeface is a paid licence from mbtype.com.

rogule.com (opens in a new tab)

Verified Roguelike Study

Code license: AGPL-3.0
Asset license: No bundled art or audio; graphics are emoji rendered by the system font.
Engine / build: Custom (JS) / npm
Browser-port confidence: 98% (checked)
Last activity: 2026-01-07

AGPL-3.0 confirmed; the game draws with emoji and has no separate art or audio files to license.

pvp (opens in a new tab)

Verified 3D shooter Study

Code license: GPL-3.0
Asset license: No separate asset licence; sprites, textures, voice and fonts sources sit in the repo under the repo licence by default.
Engine / build: Three.js / npm
Browser-port confidence: 98% (checked)
Last activity: 2025-11-14

GPL-3.0 (COPYING) with an MIT licence file also included; already a browser game, with no separate statement on its art and sound.

client (opens in a new tab)

Verified 3D shooter Study

Code license: AGPL-3.0
Asset license: README says code, textures, characters and logo are original (AI-assisted pipeline); Three.js MIT; audio pack not in repo, rights uncertain, falls back to synthesized sounds.
Engine / build: Three.js / npm
Browser-port confidence: 95% (checked)
Last activity: 2026-10-09

AGPL-3.0 confirmed (relicensed from MIT in Aug 2026); models and textures are stated as original, but audio is kept out of the repo because its rights are uncertain.

raylib-games (opens in a new tab)

Verified Engine / starter kit Foundation

Code license: zlib
Asset license: No asset license stated
Engine / build: Raylib / Make
Browser-port confidence: 92% (checked)
Last activity: 2026-08-13

zlib (LICENSE). Code license confirmed; asset provenance not audited.

Raylib-CPP-Starter-Template-for-VSCODE (opens in a new tab)

Verified Engine / starter kit Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: Raylib / Make
Browser-port confidence: 92% (checked)
Last activity: 2026-04-25

MIT (LICENSE.txt). Code license confirmed; asset provenance not audited.

raylib-game-template (opens in a new tab)

Verified Engine / starter kit Foundation

Code license: zlib
Asset license: No asset license stated
Engine / build: Raylib / Make
Browser-port confidence: 92% (checked)
Last activity: 2026-08-13

zlib (LICENSE). Code license confirmed; asset provenance not audited.

odin-raylib-hot-reload-game-template (opens in a new tab)

Verified Engine / starter kit Foundation

Code license: zlib
Asset license: No asset license stated
Engine / build: Raylib
Browser-port confidence: 92% (checked)
Last activity: 2026-08-08

zlib (LICENSE). Code license confirmed; asset provenance not audited.

NotBlox (opens in a new tab)

Verified Engine / starter kit Study

Code license: MIT
Asset license: Models and maps from Kenney and Quaternius (CC0), hosted in the separate Notblox-Assets repo.
Engine / build: Three.js / npm
Browser-port confidence: 92% (checked)
Last activity: 2026-06-07

MIT confirmed; it is already a Three.js browser game, with models from Kenney and Quaternius (CC0) hosted in a separate assets repo.

Midless (opens in a new tab)

Verified Sandbox Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: Raylib
Browser-port confidence: 92% (checked)
Last activity: 2026-10-02

MIT (LICENSE). Code license confirmed; asset provenance not audited.

RPGExample (opens in a new tab)

Verified Engine / starter kit Study

Code license: zlib
Asset license: No asset license stated
Engine / build: Raylib / Make
Browser-port confidence: 92% (checked)
Last activity: 2025-04-13

zlib (LICENSE). Code license confirmed; asset provenance not audited.

cTetris (opens in a new tab)

Verified Engine / starter kit Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Raylib / Make
Browser-port confidence: 92% (checked)
Last activity: 2026-08-20

MIT (LICENSE). Code license confirmed; asset provenance not audited.

raylib-gamejam-template (opens in a new tab)

Verified Engine / starter kit Foundation

Code license: zlib
Asset license: No asset license stated
Engine / build: Raylib / Make
Browser-port confidence: 92% (checked)
Last activity: 2026-08-13

zlib (LICENSE). Code license confirmed; asset provenance not audited.

LambdaHack (opens in a new tab)

Verified Roguelike Foundation

Code license: BSD-3-Clause
Asset license: No asset license stated
Engine / build: SDL2 / Cabal
Browser-port confidence: 90% (checked)
Last activity: 2026-09-14

BSD-3-Clause (LICENSE). Code license confirmed; asset provenance not audited.

blocks (opens in a new tab)

Verified Sandbox Study

Code license: Unlicense
Asset license: No asset license stated
Engine / build: SDL2
Browser-port confidence: 90% (checked)
Last activity: 2026-10-05

Unlicense (LICENSE.txt). Code license confirmed; asset provenance not audited.

SDLShooter (opens in a new tab)

Verified 2D shooter Study

Code license: CC0-1.0
Asset license: No asset license stated
Engine / build: SDL2 / CMake
Browser-port confidence: 90% (checked)
Last activity: 2026-03-17

CC0-1.0 (LICENSE). Code license confirmed; asset provenance not audited.

server-survival (opens in a new tab)

Verified Engine / starter kit Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Three.js / npm
Browser-port confidence: 88% (checked)
Last activity: 2026-10-08

MIT (LICENSE). Code license confirmed; asset provenance not audited.

Screenshot of server-survival, a engine / starter kit game

Claude-of-Duty (opens in a new tab)

Verified 3D shooter Study

Code license: MIT
Asset license: Procedural, no art assets
Engine / build: Three.js / npm
Browser-port confidence: 88% (checked)
Last activity: 2026-07-25

MIT (LICENSE). README says every texture, mesh and sound is generated. Uses the Call of Duty name/theme: rename before shipping.

k8sgames (opens in a new tab)

Verified Engine / starter kit Study

Code license: Apache-2.0
Asset license: No asset license stated
Engine / build: Three.js / npm
Browser-port confidence: 88% (checked)
Last activity: 2026-04-28

Apache-2.0 (LICENSE). Code license confirmed; asset provenance not audited.

template-webpack (opens in a new tab)

Verified Engine / starter kit Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: Phaser / npm
Browser-port confidence: 88% (checked)
Last activity: 2026-04-10

MIT (LICENSE). Code license confirmed; asset provenance not audited.

pillar-valley (opens in a new tab)

Verified Engine / starter kit Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Three.js / npm
Browser-port confidence: 88% (checked)
Last activity: 2026-05-26

MIT (LICENSE). Code license confirmed; asset provenance not audited.

viber3d (opens in a new tab)

Verified Engine / starter kit Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Three.js / npm
Browser-port confidence: 88% (checked)
Last activity: 2025-03-16

MIT (LICENSE). Code license confirmed; asset provenance not audited.

Screenshot of viber3d, a engine / starter kit game

inkwave (opens in a new tab)

Verified 3D shooter Study

Code license: MIT
Asset license: Procedural, no asset files
Engine / build: Three.js / npm
Browser-port confidence: 88% (checked)
Last activity: 2026-10-09

MIT (LICENSE). README says sounds and graphics are generated in code.

Screenshot of inkwave, a 3d shooter game

koil (opens in a new tab)

Verified 3D shooter Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Custom (raycaster)
Browser-port confidence: 88% (checked)
Last activity: 2025-05-11

MIT (LICENSE). Code license confirmed; asset provenance not audited.

enari-engine (opens in a new tab)

Verified 3D shooter Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: Three.js / npm
Browser-port confidence: 88% (checked)
Last activity: 2025-07-09

MIT (LICENSE). Code license confirmed; asset provenance not audited.

Screenshot of enari-engine, a 3d shooter game

vue-phaser3 (opens in a new tab)

Verified Engine / starter kit Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Phaser / npm
Browser-port confidence: 88% (checked)
Last activity: 2026-10-03

MIT (LICENSE). Code license confirmed; asset provenance not audited.

template-react-ts (opens in a new tab)

Verified Engine / starter kit Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: Phaser / npm
Browser-port confidence: 88% (checked)
Last activity: 2026-04-21

MIT (LICENSE). Code license confirmed; asset provenance not audited.

template-vite-ts (opens in a new tab)

Verified Engine / starter kit Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: Phaser / npm
Browser-port confidence: 88% (checked)
Last activity: 2026-04-21

MIT (LICENSE). Code license confirmed; asset provenance not audited.

template-react (opens in a new tab)

Verified Engine / starter kit Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: Phaser / npm
Browser-port confidence: 88% (checked)
Last activity: 2026-04-21

MIT (LICENSE). Code license confirmed; asset provenance not audited.

template-nextjs (opens in a new tab)

Verified Engine / starter kit Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: Phaser / npm
Browser-port confidence: 88% (checked)
Last activity: 2026-04-21

MIT (LICENSE). Code license confirmed; asset provenance not audited.

SunnyLand (opens in a new tab)

Verified Platformer Study

Code license: CC0-1.0
Asset license: No asset license stated
Engine / build: SDL3 / CMake
Browser-port confidence: 88% (checked)
Last activity: 2026-03-15

CC0-1.0 (LICENSE). Code license confirmed; asset provenance not audited.

template-vite (opens in a new tab)

Verified Engine / starter kit Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: Phaser / npm
Browser-port confidence: 88% (checked)
Last activity: 2026-04-29

MIT (LICENSE). Code license confirmed; asset provenance not audited.

operation-ironhold (opens in a new tab)

Verified 3D shooter Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Three.js / npm
Browser-port confidence: 88% (checked)
Last activity: 2026-10-08

MIT (LICENSE). Code license confirmed; asset provenance not audited.

Screenshot of operation-ironhold, a 3d shooter game

three-descent (opens in a new tab)

Verified 3D shooter Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Three.js / npm
Browser-port confidence: 88% (checked)
Last activity: 2026-08-16

MIT (LICENSE). Code license confirmed; asset provenance not audited.

tidewright (opens in a new tab)

Verified Sandbox Study

Code license: MIT
Asset license: Procedural, no asset files
Engine / build: WebGL / npm
Browser-port confidence: 88% (checked)
Last activity: 2026-08-06

MIT (LICENSE). README says sounds and graphics are generated in code.

Screenshot of tidewright, a sandbox game

wglt (opens in a new tab)

Verified Roguelike Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: TypeScript / npm
Browser-port confidence: 88% (checked)
Last activity: 2026-07-23

MIT (LICENSE). Code license confirmed; asset provenance not audited.

TFPS (opens in a new tab)

Verified 3D shooter Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Three.js / npm
Browser-port confidence: 88% (checked)
Last activity: 2026-06-26

MIT (LICENSE). Code license confirmed; asset provenance not audited.

gra (opens in a new tab)

Verified Platformer Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Custom (JS) / npm
Browser-port confidence: 88% (checked)
Last activity: 2025-08-02

MIT (LICENSE.md). Code license confirmed; asset provenance not audited.

poke-survivors (opens in a new tab)

Verified Top-down shooter Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Phaser / npm
Browser-port confidence: 88% (checked)
Last activity: 2026-04-06

MIT (LICENSE). Code license confirmed; asset provenance not audited.

godot-open-rpg (opens in a new tab)

Verified Engine / starter kit Study

Code license: MIT
Asset license: Credited CC0 (Kenney, Zane Little)
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-05-01

MIT (LICENSE). CREDITS.md lists external assets, all CC0 in the entries read.

Microverse (opens in a new tab)

Verified Sandbox Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Godot
Browser-port confidence: 85% (checked)
Last activity: 2026-04-10

MIT (LICENSE). Code license confirmed; asset provenance not audited.

Godot-Game-Template (opens in a new tab)

Verified Engine / starter kit Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-09-10

MIT (LICENSE.txt). Code license confirmed; asset provenance not audited.

Metroidvania-System (opens in a new tab)

Verified Platformer Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-10-07

MIT (LICENSE.txt). Code license confirmed; asset provenance not audited.

libtcod (opens in a new tab)

Verified Roguelike Foundation

Code license: BSD-3-Clause
Asset license: No asset license stated
Engine / build: Custom (C) / Make
Browser-port confidence: 85% (checked)
Last activity: 2026-10-06

BSD-3-Clause (LICENSE.txt). Code license confirmed; asset provenance not audited.

godot-game-template (opens in a new tab)

Verified Engine / starter kit Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-06-21

MIT (license file via API). Code license confirmed; asset provenance not audited.

godot-tactical-rpg (opens in a new tab)

Verified Engine / starter kit Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-02-21

MIT (LICENSE). Code license confirmed; asset provenance not audited.

godot-gamejam (opens in a new tab)

Verified Engine / starter kit Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-08-19

MIT (LICENSE). Code license confirmed; asset provenance not audited.

LabyrinthOfTheDragon (opens in a new tab)

Verified Roguelike Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Custom (C) / Make
Browser-port confidence: 85% (checked)
Last activity: 2025-08-24

MIT (LICENSE). Code license confirmed; asset provenance not audited.

GameDemo (opens in a new tab)

Verified Engine / starter kit Study

Code license: MIT
Asset license: Credited CC0 (Kenney etc.)
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-10-06

MIT (LICENSE). README credits Kenney/CC0 packs.

deck_builder_tutorial (opens in a new tab)

Verified Roguelike Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2024-10-16

MIT (LICENSE). Code license confirmed; asset provenance not audited.

Cats-Godot4-Modular-Souls-like-Template (opens in a new tab)

Verified Action RPG Foundation

Code license: Unlicense
Asset license: No asset license stated
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2025-12-21

Unlicense (LICENSE). Code license confirmed; asset provenance not audited.

Godot-PerfBullets (opens in a new tab)

Verified 2D shooter Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: Godot
Browser-port confidence: 85% (checked)
Last activity: 2025-03-06

MIT (LICENSE). Code license confirmed; asset provenance not audited.

GodotGame (opens in a new tab)

Verified Engine / starter kit Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-09-25

MIT (LICENSE). Code license confirmed; asset provenance not audited.

BulletUpHell (opens in a new tab)

Verified 2D shooter Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-05-13

MIT (LICENSE.md). Code license confirmed; asset provenance not audited.

ROTA (opens in a new tab)

Verified Platformer Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-06-25

MIT (LICENSE). Code license confirmed; asset provenance not audited.

tiny_crate (opens in a new tab)

Verified Platformer Study

Code license: Unlicense
Asset license: No asset license stated
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-06-25

Unlicense (UNLICENSE). Code license confirmed; asset provenance not audited.

godot-roguelite (opens in a new tab)

Verified Roguelike Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-07-06

MIT (LICENSE). Code license confirmed; asset provenance not audited.

godot-xr-template (opens in a new tab)

Verified Engine / starter kit Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-10-08

MIT (LICENSE). Code license confirmed; asset provenance not audited.

aarpg-tutorial (opens in a new tab)

Verified Action RPG Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-02-05

MIT (LICENSE). Code license confirmed; asset provenance not audited.

godot-2d-topdown-template (opens in a new tab)

Verified Engine / starter kit Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-09-07

MIT (LICENSE). Code license confirmed; asset provenance not audited.

sand-slide (opens in a new tab)

Verified Sandbox Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Godot
Browser-port confidence: 85% (checked)
Last activity: 2026-09-08

MIT (LICENSE.md). Code license confirmed; asset provenance not audited.

surfacer (opens in a new tab)

Verified Engine / starter kit Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-05-21

MIT (LICENSE). Code license confirmed; asset provenance not audited.

abyssal-walker (opens in a new tab)

Verified Action RPG Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-03-12

MIT (LICENSE). Code license confirmed; asset provenance not audited.

CandyWrapper (opens in a new tab)

Verified Platformer Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-06-26

MIT (LICENSE). Code license confirmed; asset provenance not audited.

Manymies (opens in a new tab)

Verified 2D shooter Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2025-06-03

MIT (LICENSE). Code license confirmed; asset provenance not audited.

bread-adventure (opens in a new tab)

Verified Platformer Study

Code license: Apache-2.0
Asset license: No asset license stated
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-04-15

Apache-2.0 (LICENSE). Code license confirmed; asset provenance not audited.

OpenFPS (opens in a new tab)

Verified 3D shooter Study

Code license: MIT
Asset license: CC BY 4.0 assets
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2025-05-27

MIT (LICENSE). README: all assets CC BY 4.0 (attribution required).

Godot-Small-FPS (opens in a new tab)

Verified 3D shooter Study

Code license: CC0-1.0
Asset license: Code CC0; credited SFX
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-02-24

CC0-1.0 (LICENSE). Code CC0; sound effects credited to third parties in the README, check each.

BoomerShooter (opens in a new tab)

Verified 3D shooter Study

Code license: MIT
Asset license: Credited CC0 (Kenney etc.)
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-07-19

MIT (LICENSE.md). README credits Kenney/CC0 packs.

no-survivor-game (opens in a new tab)

Verified Top-down shooter Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-10-02

MIT (LICENSE). Code license confirmed; asset provenance not audited.

Screenshot of no-survivor-game, a top-down shooter game

ARPG (opens in a new tab)

Verified Action RPG Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-01-24

MIT (LICENSE). Code license confirmed; asset provenance not audited.

SimpleTopDownShooterTemplate2D (opens in a new tab)

Verified Top-down shooter Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-07-15

MIT (LICENSE). Code license confirmed; asset provenance not audited.

SuperStarFighter (opens in a new tab)

Verified Top-down shooter Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-10-01

MIT (LICENSE). Code license confirmed; asset provenance not audited.

Horde_Survival_3D_Godot (opens in a new tab)

Verified Top-down shooter Study

Code license: MIT
Asset license: Kenney and KayKit CC0 models, weapons and skybox (docs/ASSET_CREDITS.md); SFX procedural.
Engine / build: Godot / Godot project
Browser-port confidence: 97% (checked)
Last activity: 2026-10-07

MIT confirmed; models and audio are Kenney and KayKit CC0, and the repo already has a Godot web export and Pages deploy.

raylib-intro-course (opens in a new tab)

Verified Engine / starter kit Study

Code license: zlib
Asset license: Lesson images, fonts and sounds distributed with the zlib-licensed course.
Engine / build: Raylib / Make
Browser-port confidence: 95% (checked)
Last activity: 2026-08-13

zlib licence confirmed for this raylib teaching course; its small lesson resources come with the course and raylib builds for the web.

godot-3-demos-2022 (opens in a new tab)

Verified Engine / starter kit Study

Code license: MIT
Asset license: Images and audio CC BY 4.0 (attribute GDQuest and contributors).
Engine / build: Godot / Godot project
Browser-port confidence: 92% (checked)
Last activity: 2025-10-06

Code is MIT and art and audio are CC BY 4.0 credited to GDQuest; these Godot 3 demos export to the web easily.

ecs-survivors (opens in a new tab)

Verified Engine / starter kit Study

Code license: GPL-3.0
Asset license: Kenney Tiny Dungeon tiles (CC0); flecs MIT, raylib zlib, tmxlite zlib.
Engine / build: Raylib / Make
Browser-port confidence: 92% (checked)
Last activity: 2026-02-04

GPL-3.0 confirmed; tile art is Kenney Tiny Dungeon (CC0) and a web build is already on itch.io.

brotato-mini (opens in a new tab)

Verified Top-down shooter Study

Code license: MIT
Asset license: Kenney Tiny Dungeon sprites and Kenney fonts CC0; bullets, floor and icons procedural (assets/CREDITS.md).
Engine / build: Godot / Godot project
Browser-port confidence: 92% (checked)
Last activity: 2026-09-08

MIT confirmed; sprites and fonts are Kenney CC0 and the other art is procedurally generated.

circuit-artist (opens in a new tab)

Verified Sandbox Study

Code license: GPL-3.0
Asset license: No separate asset licence for assets/ (images, sounds, fonts); covered by repo GPL by default.
Engine / build: Raylib
Browser-port confidence: 90% (checked)
Last activity: 2026-10-04

GPL-3.0 confirmed; the repo documents an Emscripten web build, though sounds, fonts and images have no separate licence notes.

hypnagonia (opens in a new tab)

Verified Roguelike Study

Code license: AGPL-3.0
Asset license: Assets and shaders list licences in their folders, mostly CC BY-SA 4.0; card art largely AI-generated.
Engine / build: Godot / Godot project
Browser-port confidence: 90% (checked)
Last activity: 2025-04-10

AGPL-3.0 plus a Steam addendum; assets and shaders carry their own per-folder licences, mostly CC BY-SA 4.0, and much art is AI-generated.

raylib-cpp-starter (opens in a new tab)

Verified Engine / starter kit Study

Code license: zlib
Asset license: No game assets; template only.
Engine / build: Raylib / Make
Browser-port confidence: 90% (checked)
Last activity: 2026-01-19

zlib licence confirmed; this is a raylib C++ starter template with no game assets.

riftbound-survivors (opens in a new tab)

Verified Top-down shooter Study

Code license: GPL-3.0
Asset license: Art generated by repo code (GPL); SFX and music CC0; Orbitron and Rajdhani fonts OFL (see assets/ATTRIBUTION.md).
Engine / build: Godot / Godot project
Browser-port confidence: 85% (checked)
Last activity: 2026-09-10

GPL-3.0 confirmed; art is procedurally drawn by the repo's own code, sound and music are CC0, and fonts are OFL.

SadConsole (opens in a new tab)

Verified Roguelike Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: MonoGame / dotnet
Browser-port confidence: 80% (checked)
Last activity: 2026-09-25

MIT (LICENSE.md). Code license confirmed; asset provenance not audited.

GoRogue (opens in a new tab)

Verified Roguelike Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Custom (C#) / dotnet
Browser-port confidence: 80% (checked)
Last activity: 2026-09-13

MIT (LICENSE). Code license confirmed; asset provenance not audited.

SuperTux-Classic (opens in a new tab)

Verified Platformer Study

Code license: GPL-3.0
Asset license: Remastered sprites, music and sound derived from SuperTux's GPL / CC BY-SA media; no explicit per-asset licence in repo.
Engine / build: Godot / Godot project
Browser-port confidence: 80% (checked)
Last activity: 2026-07-04

GPL-3.0 confirmed; remastered art and music derive from SuperTux media, which is GPL / CC BY-SA, but no per-file asset licence is given.

Wrecker (opens in a new tab)

Verified Sandbox Study

Code license: MIT
Asset license: No asset license stated
Engine / build: C# / dotnet
Browser-port confidence: 80% (checked)
Last activity: 2026-10-05

MIT (LICENSE). Code license confirmed; asset provenance not audited.

airplanes (opens in a new tab)

Verified 2D shooter Study

Code license: MIT
Asset license: Credited CC0 (Kenney etc.)
Engine / build: Ebitengine / Go
Browser-port confidence: 78% (checked)
Last activity: 2024-11-03

MIT (LICENSE). README credits Kenney/CC0 packs.

Screenshot of airplanes, a 2d shooter game

locas-ants (opens in a new tab)

Verified Sandbox Study

Code license: MIT
Asset license: Not stated
Engine / build: Lua
Browser-port confidence: 78% (checked)
Last activity: 2025-06-06

MIT (LICENSE). Code license confirmed; assets not documented.

mr_snuggles_dungeon_adventure (opens in a new tab)

Verified Roguelike Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Raylib / Go modules
Browser-port confidence: 78% (checked)
Last activity: 2025-08-15

MIT (LICENSE). Code license confirmed; asset provenance not audited.

mineblox (opens in a new tab)

Verified Sandbox Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Luau
Browser-port confidence: 78% (checked)
Last activity: 2025-07-06

MIT (LICENSE). Code license confirmed; asset provenance not audited.

WildWorld (opens in a new tab)

Verified Sandbox Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Love2D
Browser-port confidence: 78% (checked)
Last activity: 2026-03-31

MIT (LICENSE). Code license confirmed; asset provenance not audited.

TopHat-Shooter (opens in a new tab)

Verified Top-down shooter Study

Code license: Apache-2.0
Asset license: Procedural, no asset files
Engine / build: Raylib (Nim) / Nimble
Browser-port confidence: 78% (checked)
Last activity: 2026-10-06

Apache-2.0 (LICENSE). README says sounds and graphics are generated in code.

Vampire_Survivors-clone (opens in a new tab)

Verified Top-down shooter Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Pygame / pip
Browser-port confidence: 78% (checked)
Last activity: 2026-07-21

MIT (LICENSE). Code license confirmed; asset provenance not audited.

pyxel-survivors (opens in a new tab)

Verified Top-down shooter Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Pyxel / pip
Browser-port confidence: 78% (checked)
Last activity: 2026-09-29

MIT (LICENSE). Code license confirmed; asset provenance not audited.

bonsai (opens in a new tab)

Verified Sandbox Foundation

Code license: WTFPL
Asset license: Assets via separate release download
Engine / build: Custom (OpenGL)
Browser-port confidence: 75% (checked)
Last activity: 2026-10-05

WTFPL (LICENSE). LICENSE text matches WTFPL (permissive); assets ship as release binaries, license not stated.

exengine (opens in a new tab)

Verified 3D shooter Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: Custom (C++/OpenGL)
Browser-port confidence: 75% (checked)
Last activity: 2026-02-21

MIT (LICENSE). Code license confirmed; asset provenance not audited.

Nuake (opens in a new tab)

Verified 3D shooter Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: Custom (C++/OpenGL)
Browser-port confidence: 75% (checked)
Last activity: 2025-09-03

MIT (LICENSE). Code license confirmed; asset provenance not audited.

libTech (opens in a new tab)

Verified 3D shooter Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: Custom (C++/OpenGL)
Browser-port confidence: 75% (checked)
Last activity: 2026-04-16

MIT (LICENSE). Code license confirmed; asset provenance not audited.

tinybox (opens in a new tab)

Verified Sandbox Study

Code license: AGPL-3.0
Asset license: Per-folder licenses.txt: CC0, CC BY-SA 4.0 and MIT assets.
Engine / build: Godot
Browser-port confidence: 60% (checked)
Last activity: 2026-05-15

AGPL-3.0 confirmed; assets are mixed CC0, CC BY-SA 4.0 and MIT, listed in licenses.txt files in each data folder.

Reia (opens in a new tab)

Verified Action RPG Study

Code license: AGPL-3.0
Asset license: No separate asset licence; art and models pulled via Git LFS, presumably under the repo licence.
Engine / build: Godot / Godot project
Browser-port confidence: 40% (checked)
Last activity: 2026-10-04

AGPL-3.0 confirmed; art lives in Git LFS with no separate asset licence, and the Godot 4 plus Rust GDExtension and server stack makes a web build hard.

Thrive (opens in a new tab)

Verified Sandbox Study

Code license: GPL-3.0-or-later
Asset license: assets/LICENSE.txt: CC BY-SA 3.0 for models, textures and sounds (stored in Git LFS).
Engine / build: Godot / dotnet
Browser-port confidence: 15% (checked)
Last activity: 2026-10-09

GPL-3.0-or-later with a modding exception; assets are CC BY-SA 3.0 (assets/LICENSE.txt), but the Godot C# build has no web export.

hyperrogue (opens in a new tab)

Verified Roguelike Study

Code license: GPL-2.0
Asset license: Fonts DejaVu and OFL licences in licenses/; music tracks by named composers have no licence file in the repo.
Engine / build: SDL2 / CMake
Browser-port confidence: 95% (checked)
Last activity: 2026-09-17

GPL-2.0 confirmed and an official browser build exists; fonts are OFL / DejaVu, but the music files have no licence file in the repo.

basque (opens in a new tab)

Verified Engine / starter kit Study

Code license: MPL-2.0
Asset license: No separate licence for sprites, map data and music in assets/.
Engine / build: SDL2 / Make
Browser-port confidence: 95% (checked)
Last activity: 2026-05-18

MPL-2.0 confirmed and a WebAssembly build already runs in the browser; the sprite and music files have no separate licence.

sdl-sopwith (opens in a new tab)

Verified 2D shooter Study

Code license: GPL-2.0
Asset license: Graphics and sounds generated in code under GPL-2.0; no separate asset files.
Engine / build: SDL2 / CMake
Browser-port confidence: 95% (checked)
Last activity: 2026-09-28

GPL-2.0 confirmed; graphics are built into the code and the repo already ships an Emscripten web build script.

The-Powder-Toy (opens in a new tab)

Verified Sandbox Study

Code license: GPL-3.0
Asset license: Minimal built-in assets (font, icons) under GPL; third-party libraries listed in README.
Engine / build: SDL2
Browser-port confidence: 85% (checked)
Last activity: 2026-10-09

GPL-3.0 confirmed; the game has almost no art or audio assets, and its bundled libraries are all permissive or GPL-compatible.

bracket-lib (opens in a new tab)

Verified Roguelike Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: Custom (Rust) / Cargo
Browser-port confidence: 70% (checked)
Last activity: 2025-12-05

MIT (LICENSE). Code license confirmed; asset provenance not audited.

flare-engine (opens in a new tab)

Verified Action RPG Study

Code license: GPL-3.0
Asset license: Default mod GPL v3 and CC BY-SA 3.0; Liberation Sans (OFL) and GNU Unifont (GPL v2 with font exception).
Engine / build: FLARE engine (custom C++/SDL2) / CMake
Browser-port confidence: 70% (checked)
Last activity: 2026-10-05

GPL-3.0 confirmed for the engine; the default mod is GPL-3.0 and CC BY-SA 3.0, with OFL and GPL fonts.

termsand (opens in a new tab)

Verified Sandbox Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Rust / Cargo
Browser-port confidence: 70% (checked)
Last activity: 2026-07-21

MIT (LICENSE). Code license confirmed; asset provenance not audited.

open-strike (opens in a new tab)

Verified 3D shooter Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Custom (Rust) / Cargo
Browser-port confidence: 70% (checked)
Last activity: 2026-10-06

MIT (LICENSE). Code license confirmed; asset provenance not audited.

FallingSandEngine (opens in a new tab)

Verified Sandbox Foundation

Code license: BSD-3-Clause
Asset license: Not stated
Engine / build: Rust / Cargo
Browser-port confidence: 70% (checked)
Last activity: 2026-04-20

BSD-3-Clause (LICENSE). BSD-3 confirmed; assets under gamedir/assets not separately licensed.

roguelike (opens in a new tab)

Verified Top-down shooter Study

Code license: GPL-3.0
Asset license: No asset licence or credits; files in repo presumed under GPL-3.0.
Engine / build: SDL2 (C++)
Browser-port confidence: 70% (checked)
Last activity: 2025-09-28

GPL-3.0 confirmed for this small university project; it gives no separate licence or credits for its sprites and sounds.

RedRunner (opens in a new tab)

Verified Platformer Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Unity / Unity project
Browser-port confidence: 68% (checked)
Last activity: 2026-01-29

MIT (LICENSE). Code license confirmed; asset provenance not audited.

zircon (opens in a new tab)

Verified Roguelike Foundation

Code license: Apache-2.0
Asset license: No asset license stated
Engine / build: Kotlin
Browser-port confidence: 68% (checked)
Last activity: 2026-06-24

Apache-2.0 (LICENSE). Code license confirmed; asset provenance not audited.

lsss-wip (opens in a new tab)

Verified 2D shooter Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Unity / Unity project
Browser-port confidence: 68% (checked)
Last activity: 2026-10-08

MIT (LICENSE.md). Code license confirmed; asset provenance not audited.

PanguEngine (opens in a new tab)

Verified Sandbox Foundation

Code license: Apache-2.0
Asset license: No asset license stated
Engine / build: Java / Gradle
Browser-port confidence: 68% (checked)
Last activity: 2026-05-10

Apache-2.0 (LICENSE). Code license confirmed; asset provenance not audited.

unity-metroidvania (opens in a new tab)

Verified Platformer Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Unity / Unity project
Browser-port confidence: 68% (checked)
Last activity: 2025-01-13

MIT (LICENSE). Code license confirmed; asset provenance not audited.

spacescape (opens in a new tab)

Verified 2D shooter Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Flame / Flutter
Browser-port confidence: 68% (checked)
Last activity: 2025-10-12

MIT (LICENSE). Code license confirmed; asset provenance not audited.

Screenshot of spacescape, a 2d shooter game

dinosaur-exploder (opens in a new tab)

Verified 2D shooter Study

Code license: MIT
Asset license: No asset license stated
Engine / build: FXGL / Maven
Browser-port confidence: 68% (checked)
Last activity: 2026-10-05

MIT (LICENSE). Code license confirmed; asset provenance not audited.

Screenshot of dinosaur-exploder, a 2d shooter game

Quilly-s-Adventure (opens in a new tab)

Verified Platformer Study

Code license: MIT
Asset license: No asset license stated
Engine / build: LibGDX / Gradle
Browser-port confidence: 68% (checked)
Last activity: 2024-10-26

MIT (LICENSE). Code license confirmed; asset provenance not audited.

Neon (opens in a new tab)

Verified 2D shooter Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Android Compose / Gradle
Browser-port confidence: 68% (checked)
Last activity: 2025-11-22

MIT (LICENSE). Code license confirmed; asset provenance not audited.

hack-and-slash-framework-OLD (opens in a new tab)

Verified Action RPG Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: Unity / Unity project
Browser-port confidence: 68% (checked)
Last activity: 2025-08-02

MIT (LICENSE). Code license confirmed; asset provenance not audited.

ARPGGame (opens in a new tab)

Verified Action RPG Study

Code license: Apache-2.0
Asset license: No asset license stated
Engine / build: Unity / Unity project
Browser-port confidence: 68% (checked)
Last activity: 2026-09-07

Apache-2.0 (LICENSE). Code license confirmed; asset provenance not audited.

Clonecraft (opens in a new tab)

Verified Sandbox Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Unity / dotnet
Browser-port confidence: 68% (checked)
Last activity: 2026-09-07

MIT (LICENSE.md). Code license confirmed; asset provenance not audited.

UnityGameplayAbilitySystemSample (opens in a new tab)

Verified Action RPG Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Unity / Unity project
Browser-port confidence: 68% (checked)
Last activity: 2026-05-27

MIT (LICENSE). Code license confirmed; asset provenance not audited.

sentaur-survivors (opens in a new tab)

Verified Top-down shooter Study

Code license: Apache-2.0
Asset license: Apache-2.0 art/sfx; music CC BY 4.0
Engine / build: Unity / Unity project
Browser-port confidence: 68% (checked)
Last activity: 2026-08-21

Apache-2.0 (LICENSE). README: code, art and SFX Apache-2.0; music track CC BY 4.0 (needs credit).

TopDownShooter (opens in a new tab)

Verified Top-down shooter Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Unity / Unity project
Browser-port confidence: 68% (checked)
Last activity: 2026-09-19

MIT (LICENSE). Code license confirmed; asset provenance not audited.

vx_bevy (opens in a new tab)

Verified Sandbox Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Bevy / Cargo
Browser-port confidence: 65% (checked)
Last activity: 2024-12-11

MIT (LICENSE). Code license confirmed; asset provenance not audited.

godot-3d-multiplayer-template (opens in a new tab)

Verified Engine / starter kit Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: Godot / Godot project
Browser-port confidence: 65% (checked)
Last activity: 2026-09-02

MIT (LICENSE). Code license confirmed; asset provenance not audited.

teeworlds (opens in a new tab)

Verified Engine / starter kit Study

Code license: zlib
Asset license: license.txt: all content under data/ and datasrc/ is CC BY-SA 3.0; font has its own licence.
Engine / build: SDL2 / CMake
Browser-port confidence: 60% (checked)
Last activity: 2025-07-12

Code is under the zlib licence; everything in data and datasrc is CC BY-SA 3.0, except the font, which has its own licence.

DungeonTemplateLibrary (opens in a new tab)

Verified Roguelike Foundation

Code license: BSL-1.0
Asset license: No asset license stated
Engine / build: Godot / Unreal project
Browser-port confidence: 60% (checked)
Last activity: 2025-04-09

BSL-1.0 (license file via API). Code license confirmed; asset provenance not audited.

azimuth (opens in a new tab)

Verified Platformer Study

Code license: GPL-3.0
Asset license: Graphics drawn in code (GPL-3.0); music in data/music optionally CC BY 4.0.
Engine / build: SDL2 / Make
Browser-port confidence: 60% (checked)
Last activity: 2026-05-20

GPL-3.0 confirmed; vector graphics are drawn in code and the music may also be used under CC BY 4.0, but the old OpenGL renderer needs work for the web.

principia (opens in a new tab)

Verified Sandbox Study

Code license: BSD-3-Clause
Asset license: No separate asset licence; data/ falls under the repo BSD-3-Clause licence.
Engine / build: SDL2
Browser-port confidence: 50% (checked)
Last activity: 2026-09-23

BSD-3-Clause (Bithack AB) covers the whole repo, including the data folder; it is SDL2 plus OpenGL ES, with no web build yet.

xonotic (opens in a new tab)

Verified 3D shooter Study

Code license: GPL-3.0-or-later
Asset license: Data (xonotic-data.pk3dir) covered by the GPL-3.0+ grant in COPYING; contributors certify rights.
Engine / build: DarkPlaces (id Tech 1 derived)
Browser-port confidence: 25% (checked)
Last activity: 2026-10-06

Game code is GPL-3.0-or-later and the DarkPlaces engine is GPL-2.0-or-later; data lives in a separate repo under the same terms.

ericw-tools (opens in a new tab)

Verified Engine / starter kit Study

Code license: GPL-2.0
Asset license: No game assets; compiler tools plus test maps.
Engine / build: id Tech tools
Browser-port confidence: 20% (checked)
Last activity: 2026-09-12

GPL-2.0-or-later confirmed (GPL-3.0+ when built with Embree); these are command-line map compilers with no game assets.

Unvanquished (opens in a new tab)

Verified 3D shooter Study

Code license: GPL (with ET terms)
Asset license: COPYING.txt: media under CC BY-SA 2.5; asset paks downloaded separately from unvanquished.net.
Engine / build: Daemon (id Tech 3 derived)
Browser-port confidence: 10% (checked)
Last activity: 2026-07-17

Code is GPL (with Wolfenstein ET additional terms) and media are CC BY-SA 2.5, but assets download separately and the Daemon engine has no web build.

SLADE (opens in a new tab)

Verified Engine / starter kit Study

Code license: GPL-2.0
Asset license: No game assets; editor tool only.
Engine / build: id Tech tools
Browser-port confidence: 10% (checked)
Last activity: 2026-10-09

GPL-2.0 confirmed; SLADE is a wxWidgets desktop editor for Doom data with no game assets, so a browser port is unlikely.

netradiant-custom (opens in a new tab)

Verified Engine / starter kit Study

Code license: GPL / LGPL / BSD (mixed)
Asset license: No game assets; editor tool only.
Engine / build: id Tech tools
Browser-port confidence: 5% (checked)
Last activity: 2026-09-01

Mixed GPL, LGPL and BSD per file, inherited from GtkRadiant; it is a desktop map editor with no game assets.

taisei (opens in a new tab)

Verified 2D shooter Study

Code license: MIT
Asset license: Soundtrack (Tuck V) and portraits (afensorm) CC BY 4.0; background photos public domain or CC0; Touhou characters under ZUN's fan-work terms.
Engine / build: Custom (C/OpenGL) / Meson
Browser-port confidence: 98% (checked)
Last activity: 2026-10-06

Code is MIT and an experimental WebGL build is already playable; music and portraits are CC BY 4.0, and it is a Touhou fan game using ZUN's characters.

hydracastlelabyrinth (opens in a new tab)

Verified Platformer Study

Code license: GPL-2.0
Asset license: Original author's art and music released under GPL-2.0 with the code.
Engine / build: Custom (C) / CMake
Browser-port confidence: 98% (checked)
Last activity: 2026-08-11

GPL-2.0 confirmed with the original author's permission covering every file, and an Emscripten web version is already playable.

Rotten-Soup (opens in a new tab)

Verified Roguelike Study

Code license: GPL-3.0
Asset license: DawnLike tileset (CC BY 4.0, attribution required); maps and data under GPL-3.0.
Engine / build: PixiJS / npm
Browser-port confidence: 97% (checked)
Last activity: 2026-07-01

GPL-3.0 confirmed and it already runs in the browser; tiles come from the DawnLike tileset, which needs attribution.

OpenTTD (opens in a new tab)

Verified Sandbox Study

Code license: GPL-2.0
Asset license: Needs separate base sets: free OpenGFX/OpenSFX/OpenMSX, or proprietary Transport Tycoon Deluxe files.
Engine / build: C++
Browser-port confidence: 90% (checked)
Last activity: 2026-10-08

GPL-2.0 confirmed with an in-tree Emscripten port; it needs a base set, and the free OpenGFX, OpenSFX and OpenMSX sets avoid the proprietary original TTD data.

dose-response (opens in a new tab)

Verified Roguelike Study

Code license: AGPL-3.0
Asset license: No separate asset licence; bundled fonts carry their own licences.
Engine / build: Custom (Rust) / Cargo
Browser-port confidence: 85% (checked)
Last activity: 2026-10-05

AGPL-3.0-or-later confirmed; the art is simple tiles and bundled fonts have no separate notice in the README.

Ethertum (opens in a new tab)

Verified Sandbox Study

Code license: GPL-3.0
Asset license: No separate asset licence; assets presumed under GPL-3.0.
Engine / build: Bevy / Cargo
Browser-port confidence: 75% (checked)
Last activity: 2025-11-04

GPL-3.0 confirmed and CI already builds a WebAssembly release; textures and models carry no separate licence.

umoria (opens in a new tab)

Verified Roguelike Study

Code license: GPL-3.0
Asset license: No art or audio; text-mode game data under GPL-3.0.
Engine / build: Custom (C++) / CMake
Browser-port confidence: 75% (checked)
Last activity: 2025-07-26

GPL-3.0-or-later confirmed after the 2008 relicensing; it is a text-mode game with no art or audio.

remixed-dungeon (opens in a new tab)

Verified Roguelike Study

Code license: GPL-3.0
Asset license: No separate asset licence; Pixel Dungeon-derived art presumed GPL-3.0.
Engine / build: Custom (Java) / Gradle
Browser-port confidence: 75% (checked)
Last activity: 2026-10-09

GPL-3.0 confirmed for this Pixel Dungeon fork; art inherits the GPL with no separate notice, and an HTML build module exists in the repo.

TheSeeker (opens in a new tab)

Verified Platformer Study

Code license: MIT OR Apache-2.0
Asset license: Game assets CC BY 4.0 unless noted; Tektur and other fonts SIL OFL 1.1.
Engine / build: Bevy / Cargo
Browser-port confidence: 75% (checked)
Last activity: 2026-05-11

Code is MIT or Apache-2.0, project-owned assets are CC BY 4.0 and fonts are OFL 1.1; Bevy can target WebAssembly.

flare-game (opens in a new tab)

Verified Action RPG Study

Code license: CC BY-SA 3.0
Asset license: Art and data CC BY-SA 3.0+; Liberation, Bona Nova SC, Noto and Marck Script fonts under OFL 1.1.
Engine / build: FLARE engine / CMake
Browser-port confidence: 70% (checked)
Last activity: 2026-08-08

All Flare: Empyrean Campaign art and data are CC BY-SA 3.0 or later, and fonts are OFL; it needs the GPL-3.0 flare-engine to run.

SquidLib (opens in a new tab)

Verified Roguelike Study

Code license: Apache-2.0
Asset license: Bundled fonts and icons have separate notices (NOTICE.txt, icons-license.txt).
Engine / build: Custom (Java) / Gradle
Browser-port confidence: 70% (checked)
Last activity: 2024-10-26

Apache-2.0 confirmed for this Java roguelike library; it ships fonts and icons with their own notices, and libGDX demos already run in the browser.

shooter-rs (opens in a new tab)

Verified Top-down shooter Study

Code license: GPL-3.0
Asset license: No separate asset licence; LFS assets presumed GPL-3.0.
Engine / build: Bevy / Cargo
Browser-port confidence: 70% (checked)
Last activity: 2026-09-12

GPL-3.0 confirmed; images and sounds are in Git LFS with no separate licence, and Bevy can target WebAssembly.

zoxel (opens in a new tab)

Verified Sandbox Study

Code license: GPL-3.0
Asset license: No separate asset licence for res/; voxel content largely procedural.
Engine / build: C
Browser-port confidence: 65% (checked)
Last activity: 2025-08-10

GPL-3.0 confirmed; most content is generated in code and the res folder has no separate licence.

qengine (opens in a new tab)

Verified 3D shooter Study

Code license: GPL-2.0
Asset license: Base sounds, models and UI textures in assets/ have no separate licence; presumed GPL-2.0.
Engine / build: Custom (C++/OpenGL)
Browser-port confidence: 60% (checked)
Last activity: 2026-08-24

GPL-2.0 confirmed for this Quake II-derived engine; the bundled base assets have no separate licence statement.

roguelike (opens in a new tab)

Verified Roguelike Study

Code license: GPL-3.0
Asset license: Font derived from Spleen (BSD-2-Clause); text-mode game otherwise.
Engine / build: Zig
Browser-port confidence: 60% (checked)
Last activity: 2026-02-07

GPL-3.0 confirmed; the font is derived from Spleen under BSD-2-Clause and there is no other art.

Terasology (opens in a new tab)

Verified Sandbox Study

Code license: Apache-2.0
Asset license: No asset license stated
Engine / build: Java / Gradle
Browser-port confidence: 55% (checked)
Last activity: 2026-10-08

Apache-2.0 (LICENSE). Code license confirmed; asset provenance not audited.

opensurge (opens in a new tab)

Verified Engine / starter kit Study

Code license: GPL-3.0
Asset license: Per-asset free licences (CC0, CC BY 3.0/4.0, CC BY-SA 3.0/4.0, OFL, GPL); licence texts in licenses/.
Engine / build: Allegro / CMake
Browser-port confidence: 55% (checked)
Last activity: 2026-10-09

GPL-3.0 confirmed; art, music and fonts use assorted free licences (CC0, CC BY, CC BY-SA, OFL, GPL) with texts kept in licenses/.

rustcraft (opens in a new tab)

Verified Sandbox Study

Code license: MIT
Asset license: Original assets MIT; Pixel Perfection-derived textures CC BY-SA 4.0; fonts public domain.
Engine / build: Bevy / Cargo
Browser-port confidence: 55% (checked)
Last activity: 2025-10-02

Code and original assets are MIT; some textures come from Pixel Perfection (CC BY-SA 4.0) and fonts are public domain.

Magic_Ling_Pixel_Dungeon (opens in a new tab)

Verified Roguelike Study

Code license: GPL-3.0
Asset license: No separate asset licence; Pixel Dungeon-derived art presumed GPL-3.0.
Engine / build: LibGDX / Gradle
Browser-port confidence: 55% (checked)
Last activity: 2026-10-09

GPL-3.0 confirmed for this Shattered Pixel Dungeon fork; its art inherits the GPL with no separate asset notice.

LuaSTG-Sub (opens in a new tab)

Verified Engine / starter kit Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: LuaSTG / CMake
Browser-port confidence: 55% (checked)
Last activity: 2026-08-29

MIT (license file via API). Code license confirmed; asset provenance not audited.

Cataclysm-BN (opens in a new tab)

Verified Roguelike Study

Code license: CC BY-SA 3.0
Asset license: Data, tiles and code CC BY-SA 3.0; Terminus font OFL; soundpacks are third-party downloads with their own licences.
Engine / build: Custom (C++) / CMake
Browser-port confidence: 50% (checked)
Last activity: 2026-10-09

The whole game is CC BY-SA 3.0, an unusual choice for code, with OFL fonts; sound packs are separate downloads.

open-builder (opens in a new tab)

Verified Sandbox Study

Code license: GPL-3.0
Asset license: No separate asset licence; credits.txt names contributors only.
Engine / build: Custom (OpenGL) / CMake
Browser-port confidence: 50% (checked)
Last activity: 2025-12-10

GPL-3.0 confirmed; textures have no separate licence file, and the client-server OpenGL setup would need real porting work.

Glide (opens in a new tab)

Verified Engine / starter kit Foundation

Code license: MIT
Asset license: No asset license stated
Engine / build: Custom (Swift)
Browser-port confidence: 50% (checked)
Last activity: 2024-12-02

MIT (LICENSE). Code license confirmed; asset provenance not audited.

ivan (opens in a new tab)

Verified Roguelike Study

Code license: GPL-2.0
Asset license: Graphics and music under GPL-2.0 per LICENSING; Font2.png CC BY-SA 3.0.
Engine / build: Custom (C++) / CMake
Browser-port confidence: 50% (checked)
Last activity: 2026-09-09

GPL-2.0 confirmed; LICENSING lists bundled libraries and one CC BY-SA 3.0 font, with the rest of the art and music under the game licence.

xsofy (opens in a new tab)

Verified Roguelike Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Clojure
Browser-port confidence: 50% (checked)
Last activity: 2026-10-07

MIT (LICENSE). Code license confirmed; asset provenance not audited.

Multiplayer-FPS (opens in a new tab)

Verified 3D shooter Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Unity / Unity project
Browser-port confidence: 48% (checked)
Last activity: 2024-12-30

MIT (LICENSE). Code license confirmed; asset provenance not audited.

UnityMultiplayerARPG_MMO (opens in a new tab)

Verified Action RPG Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Unity / Unity project
Browser-port confidence: 48% (checked)
Last activity: 2026-09-30

MIT (LICENSE). Code license confirmed; asset provenance not audited.

luanti (opens in a new tab)

Verified Sandbox Study

Code license: LGPL-2.1-or-later
Asset license: LICENSE.txt: textures and sounds CC BY-SA 3.0, a few files Apache-2.0; fonts with their own licences.
Engine / build: Luanti
Browser-port confidence: 45% (checked)
Last activity: 2026-10-07

Engine code is LGPL-2.1-or-later; built-in textures and sounds are CC BY-SA 3.0 with a few Apache-2.0 files, and only experimental web ports exist.

NumcraftRust (opens in a new tab)

Verified Sandbox Study

Code license: GPL-3.0
Asset license: README states code and assets are both GPL-3.0.
Engine / build: Rust / Cargo
Browser-port confidence: 45% (checked)
Last activity: 2026-10-06

GPL-3.0 confirmed, and the README says the assets are covered by it too; the game targets NumWorks calculators.

naikari (opens in a new tab)

Verified Sandbox Study

Code license: GPL-3.0
Asset license: gfx/ARTWORK_LICENSE.yaml, fonts/FONT_LICENSE.yaml and snd/SOUND_LICENSE.yaml list per-file free licences; other data CC BY-SA 4.0.
Engine / build: Custom (OpenGL)
Browser-port confidence: 45% (checked)
Last activity: 2026-09-06

Code is GPL-3.0 (later versions for most contributors), other data is CC BY-SA 4.0, and art, font and sound licences are tracked per file in YAML.

Stella-Dei (opens in a new tab)

Verified Sandbox Study

Code license: GPL-3.0
Asset license: assets/CREDITS.txt: CC BY 3.0 music (Kevin MacLeod, Natalia Ensemble); 'Curiosity' by Aipasikon has no stated licence.
Engine / build: Zig / zig build
Browser-port confidence: 45% (checked)
Last activity: 2024-11-09

GPL-3.0 confirmed; music credits list Kevin MacLeod and Musopen tracks under CC BY 3.0, but one track has no licence.

Zombie-Annihilator (opens in a new tab)

Verified Top-down shooter Study

Code license: GPL-3.0
Asset license: No separate asset licence for resources/.
Engine / build: Custom (C++/OpenGL) / CMake
Browser-port confidence: 45% (checked)
Last activity: 2025-12-15

GPL-3.0 confirmed for this small OpenGL student game; resources have no separate licence.

minetest_game (opens in a new tab)

Verified Sandbox Study

Code license: LGPL-2.1
Asset license: LICENSE.txt: media CC BY-SA 3.0; per-mod README files list other authors and licences.
Engine / build: Luanti
Browser-port confidence: 40% (checked)
Last activity: 2026-08-16

Lua code is LGPL-2.1 and textures and sounds are CC BY-SA 3.0 (some mods credit other authors); it runs only inside the Luanti engine.

MultiCraft (opens in a new tab)

Verified Sandbox Study

Code license: LGPL-3.0-or-later
Asset license: LICENSE.txt: textures and sounds CC BY-SA 3.0 (Zughy and MultiCraft team), newer content CC BY-SA 4.0.
Engine / build: Luanti
Browser-port confidence: 40% (checked)
Last activity: 2026-10-07

Engine code is LGPL-3.0-or-later and textures and sounds are CC BY-SA 3.0 / 4.0; it is a Luanti-based fork with only experimental web paths.

hate (opens in a new tab)

Verified 3D shooter Study

Code license: GPL-3.0
Asset license: No separate asset licence for content/; presumed GPL-3.0.
Engine / build: Custom (C++/OpenGL)
Browser-port confidence: 40% (checked)
Last activity: 2026-07-22

GPL-3.0 confirmed; the content folder of maps, models and sounds has no separate licence.

ActionRPG (opens in a new tab)

Verified Action RPG Study

Code license: MIT
Asset license: No asset license stated
Engine / build: Unreal / Unreal project
Browser-port confidence: 40% (checked)
Last activity: 2026-08-31

MIT (LICENSE). Code license confirmed; asset provenance not audited.

CavEX (opens in a new tab)

Verified Sandbox Study

Code license: GPL-3.0
Asset license: Isabella II textures CC BY 3.0, font CC BY 4.0, pointer GPL-2.0, Wii controller icons licence unknown (assets/README.md).
Engine / build: Custom (OpenGL)
Browser-port confidence: 35% (checked)
Last activity: 2025-12-15

GPL-3.0 confirmed; textures are the Isabella II pack (CC BY 3.0) and the font is CC BY 4.0, but the Wii controller icons have unknown licence.

Team-Capture (opens in a new tab)

Verified 3D shooter Study

Code license: AGPL-3.0
Asset license: Own assets in separate Team-Capture-Assets repo; third-party fonts, shaders and models listed with MIT and similar notices.
Engine / build: Unity / Unity project
Browser-port confidence: 35% (checked)
Last activity: 2026-05-19

AGPL-3.0 confirmed; game assets live in a separate GitLab repo and third-party assets are listed in thirdpartylegalassets.txt.

VoxeLibre (opens in a new tab)

Verified Sandbox Study

Code license: GPL-3.0
Asset license: Textures mostly Pixel Perfection CC BY-SA 4.0, some CC BY 4.0; LEGAL.md states no non-free licences.
Engine / build: Luanti
Browser-port confidence: 35% (checked)
Last activity: 2026-09-18

GPL-3.0-or-later confirmed; LEGAL.md says no non-free media, with textures mostly from Pixel Perfection (CC BY-SA 4.0); it needs the Luanti engine to run.

astro-loop (opens in a new tab)

Verified 2D shooter Study

Code license: GPL-3.0
Asset license: Exo 2 and Orbitron fonts under SIL OFL 1.1 (THIRD_PARTY_NOTICES.md); other art presumed GPL-3.0.
Engine / build: Android / Gradle
Browser-port confidence: 35% (checked)
Last activity: 2026-10-01

GPL-3.0-only confirmed; bundled fonts are OFL, but it is a native Android app that would need a rewrite for the web.

craftium (opens in a new tab)

Verified Sandbox Study

Code license: LGPL-2.1-or-later
Asset license: LICENSE.txt: Luanti textures and sounds CC BY-SA 3.0, a few files Apache-2.0.
Engine / build: Luanti
Browser-port confidence: 30% (checked)
Last activity: 2026-02-17

Luanti fork for reinforcement learning: code is LGPL-2.1-or-later and built-in textures and sounds are CC BY-SA 3.0.

voxelfield (opens in a new tab)

Verified 3D shooter Study

Code license: GPL-3.0
Asset license: No separate asset licence for Assets/Models/Substance folders.
Engine / build: Unity / Unity project
Browser-port confidence: 30% (checked)
Last activity: 2026-05-12

GPL-3.0 confirmed for this Unity shooter; models and textures in the repo have no separate licence.

ourCraft (opens in a new tab)

Verified Sandbox Study

Code license: MIT
Asset license: No separate asset licence for resources/ (textures, music, sounds, skins).
Engine / build: Custom (OpenGL)
Browser-port confidence: 25% (checked)
Last activity: 2026-06-17

MIT confirmed for the code; textures, music, sounds and skins in resources/ have no separate licence.

Cubyz (opens in a new tab)

Verified Sandbox Study

Code license: GPL-3.0
Asset license: No separate asset licence; assets/cubyz presumed under GPL-3.0.
Engine / build: Zig / zig build
Browser-port confidence: 15% (checked)
Last activity: 2026-10-08

GPL-3.0 confirmed; textures and sounds have no separate licence, and the Zig plus modern OpenGL engine has no web target.

chunkstories (opens in a new tab)

Verified Sandbox Study

Code license: LGPL-3.0
Asset license: Content lives in separate mod repos with no licence stated here.
Engine / build: Kotlin / Gradle
Browser-port confidence: 15% (checked)
Last activity: 2025-04-21

The engine implementation is LGPL-3.0; game content ships as separate mods, and the current master is heavy work in progress.

veloren (opens in a new tab)

Verified Sandbox Study

Code license: GPL-3.0
Asset license: Assets GPL-3.0 unless credits.ron lists another licence (several CC BY / CC BY-SA entries).
Engine / build: Rust / Cargo
Browser-port confidence: 10% (checked)
Last activity: 2026-10-08

GPL-3.0 confirmed; assets default to GPL-3.0 with per-file CC exceptions in assets/credits.ron, but a browser port of this large Rust/wgpu game is unrealistic.

rigs-of-rods (opens in a new tab)

Verified Sandbox Study

Code license: GPL-3.0
Asset license: Small built-in content set under GPL; most vehicles and terrains are separately licensed community mods.
Engine / build: C++
Browser-port confidence: 5% (checked)
Last activity: 2026-10-09

GPL-3.0-or-later confirmed; the base game ships little content and most vehicles and maps are community mods with their own licences.

DungeonGenerator (opens in a new tab)

Verified Roguelike Study

Code license: GPL-3.0
Asset license: Sample maps and meshes in Content/ with no separate licence; presumed GPL-3.0.
Engine / build: Unreal / Unreal project
Browser-port confidence: 3% (checked)
Last activity: 2026-09-05

GPL-3.0 confirmed for this Unreal Engine plugin (a paid Fab edition exists separately); there is no web target.

Godot demo projects (opens in a new tab)

Not yet verified Engine / starter kit Foundation

Code license: MIT
Asset license: Mostly CC0 / MIT
Engine / build: Godot
Browser-port confidence: 5 of 5 (rough guess)

Clean starting points that export to HTML5.

Kenney asset packs (opens in a new tab)

Not yet verified Assets (2D / 3D / audio) Foundation

Code license: n/a
Asset license: CC0
Engine / build: n/a
Browser-port confidence: 5 of 5 (rough guess)

Safe art for prototypes.

OpenGameArt (opens in a new tab)

Not yet verified Assets (2D / 3D / audio) Foundation

Code license: n/a
Asset license: Mixed per asset
Engine / build: n/a
Browser-port confidence: 5 of 5 (rough guess)

Check the license of each asset.

Phaser examples (opens in a new tab)

Not yet verified Engine / starter kit Foundation

Code license: MIT
Asset license: Mixed per example
Engine / build: Phaser
Browser-port confidence: 5 of 5 (rough guess)

Browser 2D snippets.

Three.js examples (opens in a new tab)

Not yet verified Engine / starter kit Foundation

Code license: MIT
Asset license: Mixed per example
Engine / build: Three.js
Browser-port confidence: 5 of 5 (rough guess)

Browser 3D snippets.

Freedoom (opens in a new tab)

Not yet verified 3D shooter Study / Foundation

Code license: n/a (content)
Asset license: BSD 3-clause
Engine / build: Game data (WAD) for Doom engines
Browser-port confidence: 4 of 5 (rough guess)

Free replacement data for Doom engines.

raylib examples (opens in a new tab)

Not yet verified Engine / starter kit Foundation

Code license: zlib
Asset license: Mixed per example
Engine / build: raylib / C
Browser-port confidence: 4 of 5 (rough guess)

Small C starter games and samples.

SDL2 (opens in a new tab)

Not yet verified Engine / starter kit Foundation

Code license: zlib
Asset license: n/a
Engine / build: SDL2 / C
Browser-port confidence: 4 of 5 (rough guess)

Platform layer used by many references.

Armagetron Advanced (opens in a new tab)

Not yet verified Arcade Study

Code license: GPLv2+
Asset license: Mixed
Engine / build: C++
Browser-port confidence: 3 of 5 (rough guess)

Light-cycle game with network play.

AssaultCube (opens in a new tab)

Not yet verified 3D shooter Study

Code license: Custom (zlib-like)
Asset license: Mixed
Engine / build: C++ / Cube engine
Browser-port confidence: 3 of 5 (rough guess)

Compact realistic FPS from the Cube lineage.

Brogue CE (opens in a new tab)

Not yet verified Roguelike Study

Code license: AGPLv3
Asset license: Unclear
Engine / build: C
Browser-port confidence: 3 of 5 (rough guess)

Tight, readable roguelike design.

Cube 2: Sauerbraten (opens in a new tab)

Not yet verified 3D shooter Study / Foundation

Code license: zlib
Asset license: Mixed per asset
Engine / build: C++ / SDL
Browser-port confidence: 3 of 5 (rough guess)

Small readable engine with in-game level editor. Cube lineage.

DDNet (opens in a new tab)

Not yet verified 2D shooter Study / Foundation

Code license: zlib-style
Asset license: CC-BY-SA mix
Engine / build: C++
Browser-port confidence: 3 of 5 (rough guess)

Teeworlds fork with cooperative maps.

Endless Sky (opens in a new tab)

Not yet verified Action RPG Study

Code license: GPLv3
Asset license: Mixed CC-BY-SA / CC0
Engine / build: C++ / SDL
Browser-port confidence: 3 of 5 (rough guess)

Top-down space trading and combat.

Flare (opens in a new tab)

Not yet verified Action RPG Study

Code license: GPLv3
Asset license: CC-BY-SA mixed
Engine / build: C++ / SDL
Browser-port confidence: 3 of 5 (rough guess)

Diablo-like engine with data-driven content.

Freeciv (opens in a new tab)

Not yet verified Strategy Study

Code license: GPLv2+
Asset license: Mixed
Engine / build: C
Browser-port confidence: 3 of 5 (rough guess)

Turn-based strategy with web client.

Mindustry (opens in a new tab)

Not yet verified Strategy Study

Code license: GPLv3
Asset license: GPLv3
Engine / build: Java / libGDX
Browser-port confidence: 3 of 5 (rough guess)

Factory/tower-defense hybrid.

OpenArena (opens in a new tab)

Not yet verified 3D shooter Study

Code license: GPLv2
Asset license: GPLv2
Engine / build: C / ioquake3
Browser-port confidence: 3 of 5 (rough guess)

Quake III-style game with replacement assets.

Red Eclipse (opens in a new tab)

Not yet verified 3D shooter Study / Foundation

Code license: zlib
Asset license: Mostly CC-BY-SA, mixed
Engine / build: C++ / SDL (Cube 2 fork)
Browser-port confidence: 3 of 5 (rough guess)

Parkour-style arena shooter on the Cube 2 engine.

Shattered Pixel Dungeon (opens in a new tab)

Not yet verified Roguelike Study

Code license: GPLv3
Asset license: Mixed
Engine / build: Java / libGDX
Browser-port confidence: 3 of 5 (rough guess)

Polished mobile-style roguelike.

SuperTux (opens in a new tab)

Not yet verified Platformer Study

Code license: GPLv3
Asset license: CC-BY-SA / GPL
Engine / build: C++ / SDL
Browser-port confidence: 3 of 5 (rough guess)

Level format and enemy behaviors.

Teeworlds (opens in a new tab)

Not yet verified 2D shooter Study / Foundation

Code license: zlib-style
Asset license: CC-BY-SA mix
Engine / build: C++
Browser-port confidence: 3 of 5 (rough guess)

2D weapons and movement. Relevant to Madness-style action.

Battle for Wesnoth (opens in a new tab)

Not yet verified Strategy Study

Code license: GPLv2+
Asset license: GPLv2+
Engine / build: C++ + Lua scripting
Browser-port confidence: 2 of 5 (rough guess)

Data-driven campaigns and units.

Cataclysm: Dark Days Ahead (opens in a new tab)

Not yet verified Roguelike Study

Code license: CC-BY-SA 3.0
Asset license: CC-BY-SA 3.0
Engine / build: C++ / curses+SDL
Browser-port confidence: 2 of 5 (rough guess)

Huge content system and data-driven mods.

Dungeon Crawl Stone Soup (opens in a new tab)

Not yet verified Roguelike Study

Code license: GPLv2+
Asset license: Mixed (CC0 tiles)
Engine / build: C++
Browser-port confidence: 2 of 5 (rough guess)

Mature balance and content data.

Hedgewars (opens in a new tab)

Not yet verified Artillery Study

Code license: GPLv2
Asset license: Mixed free
Engine / build: Haskell / C++ / Lua
Browser-port confidence: 2 of 5 (rough guess)

Weapons and physics tuning.

Luanti (Minetest) (opens in a new tab)

Not yet verified Sandbox Study / Foundation

Code license: LGPLv2.1+
Asset license: CC-BY-SA 3.0
Engine / build: C++ / Lua modding
Browser-port confidence: 2 of 5 (rough guess)

Mod-friendly voxel sandbox engine.

OpenRA (opens in a new tab)

Not yet verified Strategy Study

Code license: GPLv3
Asset license: Mixed
Engine / build: C# / .NET
Browser-port confidence: 2 of 5 (rough guess)

RTS engine with a mod system. .NET build.

OpenTTD (opens in a new tab)

Not yet verified Strategy Study

Code license: GPLv2
Asset license: GPLv2
Engine / build: C++
Browser-port confidence: 2 of 5 (rough guess)

Long-lived simulation codebase.

Tales of Maj'Eyal (opens in a new tab)

Not yet verified Roguelike Study

Code license: GPLv3
Asset license: Mixed
Engine / build: Lua / T-Engine
Browser-port confidence: 2 of 5 (rough guess)

Deep RPG systems; moddable.

Unvanquished (opens in a new tab)

Not yet verified 3D shooter Study

Code license: GPLv3
Asset license: Mixed, mostly CC-BY-SA
Engine / build: C++ / Daemon engine
Browser-port confidence: 2 of 5 (rough guess)

Team shooter with RTS elements.

Xonotic (opens in a new tab)

Not yet verified 3D shooter Study

Code license: GPLv3
Asset license: Mostly GPL, mixed
Engine / build: C++ / DarkPlaces (Quake lineage)
Browser-port confidence: 2 of 5 (rough guess)

Deep weapon balance and movement tuning to study.

0 A.D. (opens in a new tab)

Not yet verified Strategy Study

Code license: GPLv2+
Asset license: CC-BY-SA
Engine / build: C++ / JS scripting
Browser-port confidence: 1 of 5 (rough guess)

Large RTS; strong modding data.

Pioneer (opens in a new tab)

Not yet verified Simulation Study

Code license: GPLv3
Asset license: Mixed
Engine / build: C++ / Lua
Browser-port confidence: 1 of 5 (rough guess)

Open-world space game.

SuperTuxKart (opens in a new tab)

Not yet verified Racing Study

Code license: GPLv3
Asset license: Mixed free
Engine / build: C++
Browser-port confidence: 1 of 5 (rough guess)

Kart racer with large asset set.

Veloren (opens in a new tab)

Not yet verified Sandbox Study

Code license: GPLv3
Asset license: Mixed (CC-BY-SA)
Engine / build: Rust
Browser-port confidence: 1 of 5 (rough guess)

Voxel multiplayer RPG; large Rust ECS codebase.

Chocolate Doom (opens in a new tab)

Not yet verified 3D shooter Study

Code license: GPLv2
Asset license: Original Doom data is proprietary
Engine / build: C / SDL
Browser-port confidence: 4 of 5 (rough guess)

Code-only reference: original game data is proprietary and must not be shipped.

Faithful, readable Doom source port.

ioquake3 (opens in a new tab)

Not yet verified 3D shooter Study

Code license: GPLv2
Asset license: Original Quake III data is proprietary
Engine / build: C / own engine
Browser-port confidence: 3 of 5 (rough guess)

Code-only reference: original game data is proprietary and must not be shipped.

Code reference for Quake III. Never ship original Q3 assets.

Odamex (opens in a new tab)

Not yet verified 3D shooter Study

Code license: GPLv2
Asset license: Original Doom data is proprietary
Engine / build: C++ / SDL
Browser-port confidence: 3 of 5 (rough guess)

Code-only reference: original game data is proprietary and must not be shipped.

Multiplayer Doom port; netcode reference.

OpenXcom (opens in a new tab)

Not yet verified Strategy Study

Code license: GPLv3
Asset license: Needs original X-COM data
Engine / build: C++ / SDL
Browser-port confidence: 3 of 5 (rough guess)

Code-only reference: original game data is proprietary and must not be shipped.

Tactical game engine reimplementation.

Quakespasm (opens in a new tab)

Not yet verified 3D shooter Study

Code license: GPLv2
Asset license: Original Quake data is proprietary
Engine / build: C / SDL
Browser-port confidence: 3 of 5 (rough guess)

Code-only reference: original game data is proprietary and must not be shipped.

Clean Quake 1 engine port.

Yamagi Quake II (opens in a new tab)

Not yet verified 3D shooter Study

Code license: GPLv2
Asset license: Original Quake II data is proprietary
Engine / build: C / SDL
Browser-port confidence: 3 of 5 (rough guess)

Code-only reference: original game data is proprietary and must not be shipped.

Code reference for Quake II.

EDuke32 (opens in a new tab)

Not yet verified 3D shooter Study

Code license: GPL (build engine license)
Asset license: Original Duke3D data is proprietary
Engine / build: C / SDL
Browser-port confidence: 2 of 5 (rough guess)

Code-only reference: original game data is proprietary and must not be shipped.

Build-engine source port.

GZDoom (opens in a new tab)

Not yet verified 3D shooter Study

Code license: GPL-style (custom terms)
Asset license: Original Doom data is proprietary
Engine / build: C++ / OpenGL
Browser-port confidence: 2 of 5 (rough guess)

Code-only reference: original game data is proprietary and must not be shipped.

Code reference for a modern Doom source port with scripting.

OpenMW (opens in a new tab)

Not yet verified Action RPG Study

Code license: GPLv3
Asset license: Needs original Morrowind data
Engine / build: C++
Browser-port confidence: 1 of 5 (rough guess)

Code-only reference: original game data is proprietary and must not be shipped.

Engine reimplementation; scripting reference.

actionhero (opens in a new tab)

Not yet verified Engine / starter kit Study / Foundation

Code license: Apache-2.0
Asset license: Not listed
Engine / build: JS (npm) HTML5/JS
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2026-07-23

The reusable, scalable, and quick node.js API server for stateless and stateful applications

antha (opens in a new tab)

Not yet verified Engine / starter kit Study / Foundation

Code license: (MIT OR CC0-1.0)
Asset license: Not listed
Engine / build: JS (npm)
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2026-09-28

A simple-to-use all-in-one Antha engine variant with default mods.

box3d-wasm (opens in a new tab)

Not yet verified Engine / starter kit Study / Foundation

Code license: MIT
Asset license: Not listed
Engine / build: JS (npm)
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2026-07-02

Box3D, Erin Catto's 3D physics engine, compiled to WebAssembly with SIMD and optional wasm threads. Isomorphic: works in browsers and Node.js, auto-detecting th

claude-tetris (opens in a new tab)

Not yet verified Puzzle Study / Foundation

Code license: MIT
Asset license: Not listed
Engine / build: JS (npm)
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2026-10-02

Play Tetris in a split pane beside Claude Code — auto-pauses when Claude is done, resumes on your next prompt.

cli-legend (opens in a new tab)

Not yet verified Roguelike Study / Foundation

Code license: MIT
Asset license: Not listed
Engine / build: JS (npm)
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2025-03-10

"A fun command-line rogurelike dungeon game"

crashcat (opens in a new tab)

Not yet verified Engine / starter kit Study / Foundation

Code license: MIT
Asset license: Not listed
Engine / build: JS (npm)
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2026-07-06

a 3d physics library for games and simulations

create-pixifact (opens in a new tab)

Not yet verified Engine / starter kit Study / Foundation

Code license: MIT
Asset license: Not listed
Engine / build: JS (npm) PixiJS
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2026-09-30

创建 Pixifact 游戏项目。

create-playcanvas (opens in a new tab)

Not yet verified Engine / starter kit Study / Foundation

Code license: MIT
Asset license: Not listed
Engine / build: JS (npm) WebGL
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2026-10-08

Scaffold a PlayCanvas project

create-vimp-game (opens in a new tab)

Not yet verified Engine / starter kit Study / Foundation

Code license: MIT
Asset license: Not listed
Engine / build: JS (npm)
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2026-10-07

Scaffolder for VIMP game plugins

dsh-agentnoodle (opens in a new tab)

Not yet verified RPG Study / Foundation

Code license: MIT
Asset license: Not listed
Engine / build: JS (npm)
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2026-08-31

可扩展的 AI 群像聊天游戏框架（DeepSeek Harness 插件）：输入一个行动，多个 NPC 各自回应，带头像插图；世界、地点、NPC 与功能扩展都可在对话里让 agent 直接添加修改，无需写代码。

dsh-running-liang (opens in a new tab)

Not yet verified Engine / starter kit Study / Foundation

Code license: MIT
Asset license: Not listed
Engine / build: JS (npm)
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2026-08-21

A Chrome dino-run style mini-game for DeepSeek Harness Web: play while waiting for the agent, score from 梁子 to 梁圣. / 为 DeepSeek Harness Web 打造的等待小游戏：agent 回复时玩一

emeraldengine (opens in a new tab)

Not yet verified Engine / starter kit Study / Foundation

Code license: MIT
Asset license: Not listed
Engine / build: JS (npm) WebGL
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2026-09-19

2D graphics library for Web

enable3d (opens in a new tab)

Not yet verified Engine / starter kit Study / Foundation

Code license: LGPL-3.0
Asset license: Not listed
Engine / build: JS (npm) Three.js
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2025-03-08

3D Framework for Web, Mobile and PC

excalibur (opens in a new tab)

Not yet verified Engine / starter kit Study / Foundation

Code license: BSD-2-Clause
Asset license: Not listed
Engine / build: JS (npm) Canvas
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2025-12-23

Excalibur.js is a simple JavaScript game engine with TypeScript bindings for making 2D games in HTML5 Canvas. Our mission is to make web game development as sim

fondue-city-mcp (opens in a new tab)

Not yet verified Engine / starter kit Study / Foundation

Code license: MIT
Asset license: Not listed
Engine / build: JS (npm)
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2026-09-24

MCP server for Fondue City — let any MCP-capable agent play the persistent AI-run restaurant world at https://fondue.city.

gamedig (opens in a new tab)

Not yet verified Engine / starter kit Study / Foundation

Code license: MIT
Asset license: Not listed
Engine / build: JS (npm)
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2026-05-26

Query for the status of any game server in Node.JS

iris-ecs (opens in a new tab)

Not yet verified Engine / starter kit Study / Foundation

Code license: MIT
Asset license: Not listed
Engine / build: JS (npm) HTML5/JS
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2026-09-06

Entity Component System implementation for TypeScript

jclic (opens in a new tab)

Not yet verified Puzzle Study

Code license: EUPL-1.2
Asset license: Not listed
Engine / build: JS (npm) HTML5/JS
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2026-06-11

HTML5 player for JClic activities

kahoot.js-latest (opens in a new tab)

Not yet verified Engine / starter kit Study / Foundation

Code license: MIT
Asset license: Not listed
Engine / build: JS (npm)
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2026-04-29

Answer, Join Kahoot Quizzes with nodejs

koishi-plugin-bull-card (opens in a new tab)

Not yet verified Card / board Study / Foundation

Code license: MIT OR Apache-2.0
Asset license: Not listed
Engine / build: JS (npm)
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2026-10-02

Koishi 插件：斗牛牌局，支持娱乐比牌与金币下注两种模式。

koishi-plugin-card-21-game (opens in a new tab)

Not yet verified Card / board Study / Foundation

Code license: MIT OR Apache-2.0
Asset license: Not listed
Engine / build: JS (npm)
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2026-10-02

Koishi 插件：21 点，支持玩家对战、庄家模式与货币下注。

koishi-plugin-ciyi (opens in a new tab)

Not yet verified Engine / starter kit Study / Foundation

Code license: MIT OR Apache-2.0
Asset license: Not listed
Engine / build: JS (npm)
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2026-09-26

Koishi 群聊猜词：每天一个两字词，支持续猜和排行榜。

koishi-plugin-lom-bridge (opens in a new tab)

Not yet verified RPG Study / Foundation

Code license: MIT
Asset license: Not listed
Engine / build: JS (npm)
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2026-10-06

《诡秘之主：群星低语》同人文字游戏 —— 内核一起打包，装完就能玩

koishi-plugin-mcdle (opens in a new tab)

Not yet verified Engine / starter kit Study / Foundation

Code license: MIT OR Apache-2.0
Asset license: Not listed
Engine / build: JS (npm)
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2026-10-02

Koishi 插件：玩《我的世界》猜谜，凭属性提示从生物、物品、方块中锁定唯一答案。

koishi-plugin-number-merge-game (opens in a new tab)

Not yet verified Engine / starter kit Study / Foundation

Code license: MIT OR Apache-2.0
Asset license: Not listed
Engine / build: JS (npm)
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2026-10-02

Koishi 插件：2048 数字合并小游戏，支持同频道对局、生涯战绩与排行榜。

koishi-plugin-see-color (opens in a new tab)

Not yet verified Engine / starter kit Study / Foundation

Code license: MIT OR Apache-2.0
Asset license: Not listed
Engine / build: JS (npm)
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2026-10-02

Koishi 插件：在群里玩找异色块的拼眼力小游戏，支持积分排行。

koishi-plugin-wordle-game (opens in a new tab)

Not yet verified Engine / starter kit Study / Foundation

Code license: MIT OR Apache-2.0
Asset license: Not listed
Engine / build: JS (npm)
Browser-port confidence: 4 of 5 (rough guess)
Last activity: 2026-10-02

Koishi 插件：猜词游戏，支持单词、成语、数字与方程式等多种模式。

Avoid for now (50)

License text was read and something stood out. Some may still be fine for study.

U3-SDK (opens in a new tab) (Sandbox, code Proprietary (U3 SDK licence))
This is Smartly Dressed Games' proprietary U3 SDK licence, limited to non-commercial modding, not an open-source licence.
Godot-GameTemplate (opens in a new tab) (Top-down shooter, code MIT)
Code MIT (LICENSE). README adds its own asset terms (no resale as your own creation); not a standard license.
opensoldat (opens in a new tab) (2D shooter, code MIT)
Code MIT (LICENSE.md). Code MIT; assets come from a separate download with no license found in the repo. Study only until checked.
doukutsu-rs (opens in a new tab) (Platformer, code MIT)
Code MIT (LICENSE). Engine reimplementation, MIT code, but the game data is not redistributable. Study only.
drl (opens in a new tab) (Roguelike, code GPL-2.0)
Code is GPL-2.0 and art is CC BY-SA 4.0, but music and sound must be copied from the binary release with no stated licence.
Expo-Crossy-Road (opens in a new tab) (Engine / starter kit, code MIT)
Code MIT (LICENSE). README says it uses copyrighted work under a fair-use/educational claim. Study only.
godot-4-3d-third-person-controller (opens in a new tab) (Engine / starter kit, code MIT)
Code is MIT, but all textures and 3D models are CC BY-NC-SA 4.0, which forbids commercial use.
TetraForce (opens in a new tab) (Action RPG, code MIT)
Code MIT (LICENSE). Zelda-style fan game; Nintendo-derived content likely. Study only.
ZQuestClassic (opens in a new tab) (Action RPG, code GPL-3.0)
Code is GPL-3.0 and an experimental web version exists, but the bundled classic quest and tileset are built on Nintendo Zelda graphics.
sandboxels (opens in a new tab) (Sandbox, code R74n Content License (all rights reserved))
The custom R74n Content License is all rights reserved, bans commercial use and lets the owner demand removal at any time.
bull-rush (opens in a new tab) (Engine / starter kit, code MIT)
Code MIT (LICENSE). Its own ASSET_PROVENANCE.md lists unlicensed music and undocumented images. Code only.
Moondust-Project (opens in a new tab) (Engine / starter kit, code GPL-3.0)
GPL-3.0 confirmed for code, but the usual playable content packs reuse Nintendo Mario graphics, so the assets are not cleanly licensed.
pebble (opens in a new tab) (Sandbox, code MIT)
Code is MIT, but it bundles the third-party Faithful 32x Minecraft texture pack and is a native macOS Swift and Metal app.
sour (opens in a new tab) (3D shooter, code MIT)
Code MIT (LICENSE). ~1 GB of Cube 2 assets with varied per-file licenses; repo ships a subset. Needs per-asset review.
OpenTournament (opens in a new tab) (3D shooter, code All rights reserved)
All rights reserved: source is provided only for developing the official Open Tournament, and assets are used with permission exclusively for it.
forsaken (opens in a new tab) (3D shooter, code GPL-2.0)
New code is GPL-2.0, but the LICENSE says the original Forsaken code is abandonware, and the game data comes from the original commercial release.
GnollHack (opens in a new tab) (Roguelike, code NetHack General Public License)
Code is under the NetHack General Public License, but the GnollHack art, music and voiceovers carry no stated licence.
frontier-station-14 (opens in a new tab) (Sandbox, code AGPL-3.0)
Code is AGPL-3.0 with MIT parts, but some assets are CC BY-NC-SA (non-commercial) alongside the usual CC BY-SA 3.0.
tails-adventure (opens in a new tab) (Platformer, code GPL-3.0)
Code is GPL-3.0, but this is a remake of Sega's Tails Adventure and its sprites and music are Sega-derived.
eagler-touhou (opens in a new tab) (2D shooter, code GPL-3.0)
Launcher code is GPL-3.0-or-later, but it exists to run ZUN's proprietary Touhou games, whose data each player must supply.
madness-interactive-reloaded (opens in a new tab) (Sandbox, code GPL-3.0)
Code is GPL-3.0, but the game is based on the Madness Combat franchise and gives no licence for its art and audio.
celeste (opens in a new tab) (Platformer, code MIT)
Code MIT (LICENSE). Recreation of Celeste Classic; game design/art are third-party IP. Study only.
Polymer (opens in a new tab) (Sandbox, code MIT)
Code MIT (LICENSE). Minecraft client; downloads original Mojang assets at first run. Study only.
Super-Mario-Phaser (opens in a new tab) (Platformer, code MIT)
Code MIT (LICENSE). Super Mario clone; characters/art are Nintendo IP regardless of the MIT code. Study only.
danmokou (opens in a new tab) (2D shooter, code MIT)
Engine code is MIT, but its own licence file says many non-code assets (such as those by DD and dairi) are not allowed for commercial use.
3D-Survival-Game-Unity (opens in a new tab) (Sandbox, code MIT)
Code MIT (LICENSE). Kenney assets are CC0, but Lmhpoly Low Poly Pack is a store asset that likely cannot be redistributed.
friendlyfiregame (opens in a new tab) (Platformer, code None (personal use only))
No licence has been chosen yet; the LICENSE file only allows personal use and forbids repackaging.
warbell (opens in a new tab) (Action RPG, code PolyForm Noncommercial 1.0.0)
PolyForm Noncommercial 1.0.0 is source-available, not open source, and reserves all commercial use.
backrooms-noclip (opens in a new tab) (Roguelike, code PolyForm Noncommercial 1.0.0)
Code and game are under PolyForm Noncommercial 1.0.0, so commercial use is not allowed; lore text is CC BY-SA 3.0 from the Backrooms wiki.
tomenet (opens in a new tab) (Roguelike, code Moria/Angband (non-commercial))
Most code is under the non-commercial Moria/Angband licence, and the networking code needs written permission for derivatives.
binding-of-isaac-webgame (opens in a new tab) (Roguelike, code MIT)
Code MIT (LICENSE). Binding of Isaac clone; theme/characters are third-party IP (art is code-drawn per README). Treat as study only.
zorbash (opens in a new tab) (Roguelike, code GPL-3.0)
Code is GPL-3.0 (src/LICENSE), but art and sound come from paid packs such as Oryx Design Lab and itch.io creators.
Wolfenshine (opens in a new tab) (3D shooter, code MIT)
Code MIT (LICENSE). Engine reimplementation, MIT code, but reads the original game's maps, art and sound. Study only.
Doom2D-Forever (opens in a new tab) (Platformer, code GPL-3.0)
Code is GPL-3.0, but the game resources are kept separately and derive from the 1996 Doom 2D, with no free licence stated.
flame_simple_platformer (opens in a new tab) (Platformer, code MIT)
Code MIT (LICENSE). README: some assets belong to others with individual terms. Code only.
Unangband (opens in a new tab) (Roguelike, code GPL-2.0)
Only UnAngband's changes are GPL; the underlying Angband 2.9.1 code still carries the non-commercial Moria/Angband licence.
Obsidian (opens in a new tab) (Action RPG, code GPL-3.0)
Code is GPL-3.0, but the README says many referenced assets are not in the repo, so the Unreal project cannot be built as is.
claude-of-duty (opens in a new tab) (3D shooter, code MIT)
Code MIT (LICENSE). Fan project; its own ASSET_NOTICE says MIT covers code only, not derived maps/models/audio/names. Code-only study reference.
javascript-delta (opens in a new tab) (2D shooter, code MIT)
Code MIT (LICENSE). README: sounds are CC-licensed from freesound.org (per-file terms, some may be BY-NC).
th06-sdl2 (opens in a new tab) (2D shooter, code CC0-1.0)
Code CC0-1.0 (LICENSE). Port of a copyrighted game built on a reconstruction; needs the original DAT files. CC0 label does not cover the game. Study only.
godot-cmvalley (opens in a new tab) (3D shooter, code MIT)
Code MIT (LICENSE.md). README: textures licensed under various proprietary licenses. Code only.
youtube-action-rpg (opens in a new tab) (Action RPG, code MIT)
Code MIT (LICENSE.txt). README: sprites are CC BY-NC-SA 4.0 (non-commercial, share-alike). Code only.
galangua (opens in a new tab) (2D shooter, code MIT)
Code MIT (LICENSE). Galaga clone; name/characters are Bandai Namco IP. Study only.
survivors-roguelike-kit (opens in a new tab) (Top-down shooter, code MIT)
Code MIT (LICENSE). README: pixel art generated with AI tools; DOTween has a separate license; third-party assets to be checked.
pk2_greta (opens in a new tab) (Platformer, code CC BY-NC 4.0)
The whole work, code and assets alike, is licensed CC BY-NC 4.0, which forbids commercial use.
2d-minecraft (opens in a new tab) (Sandbox, code zlib)
Code zlib (LICENSE). Minecraft-themed; asset provenance not documented (inferred, not confirmed). Study only.
quick-dungeon-crawler-rpg-od (opens in a new tab) (Action RPG, code AGPL-3.0)
Code is AGPL-3.0 and it already runs in the browser, but monster sprites and music are third-party itch.io and SoundCloud packs with their own terms.
skynet-godot (opens in a new tab) (3D shooter, code GPL-3.0)
The port's own code is GPL-3.0, but it needs the original Terminator SkyNET game data, which is proprietary and must be supplied by the player.
retro-action-rpg (opens in a new tab) (Action RPG, code MIT)
Code MIT (LICENSE.txt). README: all sound, music and sprites are CC BY-NC-SA 4.0 (non-commercial). Code only.
Monkanics (opens in a new tab) (Top-down shooter, code AGPL-3.0)
Code is AGPL-3.0, but every model, texture, sound and music file is CC BY-NC-SA 4.0 (non-commercial).

License rules of thumb

Code and assets are licensed separately. A game can have MIT code and restricted art. Check both.
Permissive (MIT, zlib, BSD, Apache, CC0): usable in a paid, closed-source game with the required credit.
GPL family: fine to study. Shipping GPL code means releasing your game's source under GPL.
CC-BY / CC-BY-SA art: credit required. SA means derivatives use the same license.
Non-commercial licenses: study only if your game is paid.
Never ship original Doom or Quake assets. The engines are GPL, but the original game data is still commercial.
Ideas, mechanics and tuning numbers are free to learn from. Copied code and art are not.

Where to look for more

GitHub topics: game, godot-game, open-source-game
GitLab
Codeberg
SourceHut
SourceForge
js13kGames: tiny readable browser games
Game jam entries with source (Ludum Dare, GMTK)
itch.io open-source tag
npm and PyPI
Godot, Phaser and Three.js galleries
Debian games and Flathub
LibreGameWiki
OpenGameArt: check each asset
Kenney: CC0 asset packs

Questions for you

Which genre is the first original game? That decides which references matter most.
UE5 or Construct 3 first? It changes whether 3D or 2D references come first.
Will the first game be sold? If yes, only permissive code and clear art can go in it.
Do you have a specific Madness-style game in mind as a study target? None is listed yet.
Which entries should get a screenshot and a closer asset check next?