- godot by godotengine, 120k stars. Multi-platform 2D and 3D game engine
- Babylon.js by BabylonJS, 26k stars. 3D rendering and game engine for the web built on WebGL
- WaveFunctionCollapse by mxgmn, 26k stars. C# procedural generator that builds bitmaps and tilemaps from one sample image
- pyxel by kitao, 19k stars. Retro game engine for making pixel-art games in Python
- aframe by aframevr, 18k stars. HTML-based framework for building WebVR and VR scenes
- unity-mcp by CoplayDev, 16k stars. MCP server that lets AI assistants control the Unity Editor
- Pumpkin by Pumpkin-MC, 13k stars. Minecraft server written in Rust, aimed at speed and efficiency
- JoltPhysics by jrouwe, 12k stars. Multi-core rigid body physics and collision library in C++ for games and VR
- horizon by horizon-rust, 9.8k stars. Minecraft Java Edition reimplemented in Rust, with a launcher
- pixelfx by patch-gg, 7.5k stars. Collection of 244 pixel art effects in JavaScript plus a Claude Code skill
- godogen by htdt, 7.3k stars. Autonomous Godot game development driven by Claude Code and Codex
- sbox-public by Facepunch, 6.5k stars. Source code for the s&box game engine built on Source 2 and .NET
- Unity-MCP by IvanMurzak, 4.6k stars. MCP server and CLI that lets AI agents build and test Unity projects
- fheroes2 by ihhub, 3.7k stars. Open source engine reimplementing Heroes of Might and Magic II
- BRUTAL by ahwootech, 2.5k stars. C# framework for games and game engines with direct Vulkan access
- Claw3D by iamlukethedev, 2.5k stars. Open source 3D engine for games, simulations and interactive 3D apps
- kaplay by kaplayjs, 1.8k stars. JavaScript and TypeScript game library for building 2D games
- REDox by CAPCOM-TD-OSS, 1.8k stars. Token-based structured data engine for .NET used in a game engine
- usagi by brettchalupa, 882 stars. 2D game engine for rapid prototyping in Lua with live reload and export
- Hermes3D by iamlukethedev, 785 stars. Open source 3D engine for games, simulations and interactive 3D apps
- aseprite-ai-artist by with-pebbly, 694 stars. MCP server and skills that let coding agents draw pixel art in Aseprite
- anymove by patch-gg, 593 stars. Fits a rig to an animal from AI video using two camera views and exports GLB
- CnCGeneralsZH-Reforged by olcayseygan, 334 stars. Reimplementation of Zero Hour with Direct3D 11 and fixes to original bugs
- project-hedra by maxilevi, 196 stars. 3D open world game written in C# with OpenGL, around 100k lines of code
- ArcadeMaker by ArcadeMakerSources, 162 stars. Cross-platform 2D game engine with its own language and IDE
- parin by Kapendev, 148 stars. Small cross-platform 2D game engine written in D
- build-world by thrixel, 116 stars. Toolkit for building interactive 3D worlds with assets and AI coding agents
- moonbasic by CharmingBlaze, 91 stars. BASIC-style language and runtime for 2D and 3D games built on raylib
- OMF-2097-Remastered by Jared-woodruff, 49 stars. Browser remake of One Must Fall 2097 running the original game files
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