Entitas is a super fast Entity Component System (ECS) Framework specifically made for C# and Unity
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Minecraft: Java Edition 26.3 rewritten from scratch in Rust, checked against vanilla with 281 differential harnesses. Get it with the Horizon launcher.
- differential-testing
- game-engine
- linux
- minecraft
A modern & fully featured HTML5 game engine (2D & 3D) for JavaScript/TypeScript, with WebGL/WebGPU rendering, built-in physics, Tiled map & glTF support and WebAudio.
- html5-game-engine
- javascript-game-engine
- 2d
- agent-skills
2D JavaScript Physics Engine
- game-development
- javascript
- physics-engine
- box2d
Powerful, mature open-source cross-platform game engine for Python and C++, developed by Disney and CMU
- game-engine
- open-source
- panda3d
- cross-platform
244 pixel art effects, every one a small piece of code. Plus a Claude Code skill to make your own.
- agent-skills
- animation
- canvas
- claude-code-plugin
Java / JavaFX / Kotlin Game Library (Engine)
A high performance, editable terrain system for Godot 4.
- godot-plugin
- godot4
- terrain
- gamedev-tool
AI Skills, MCP Tools, and CLI for Unity Engine. Full AI develop and test loop. Use cli for quick setup. Efficient token usage, advanced tools. Any C# method may be turned into a tool by a single line. Works with Claude Code, Gemini, Copilot, Cursor and any other absolutely for free.
- ai
- ai-integration
- game-development
- mcp
Terasology - open source voxel world
Improved version of the X-Ray Engine, the game engine used in the world-famous S.T.A.L.K.E.R. game series by GSC Game World. Join OpenXRay! ;)
- directx11
- opengl
- cpp17
- game-engine
🐝 behavior tree AI for Godot Engine
FNA - Accuracy-focused XNA4 reimplementation for open platforms
- xna
- fna
- csharp
- gamedev
JavaScript 2D physics library
Lua Virtual Reality Framework
- vr
- openvr
- lua
- virtual-reality
Godot Jolt is a Godot extension that integrates the Jolt physics engine
- game-development
- gdextension
- godot
- godot-engine
A free, open source C# framework for making games, or your own game engine. Direct access to native APIs and Vulkan, with the low-level libraries around them. The foundation under Kitten Space Agency and RimWorld's Waylith engine.
- csharp
- dotnet
- game-engine
- vulkan
pyglet is a cross-platform windowing and multimedia library for Python, for developing games and other visually rich applications.
An open source library for creative expression on the web, desktop, mobile and consoles. Inspired by the classic Flash and AIR APIs.
- adobe-air
- adobe-flash
- cross-platform
- flash
Python MUD/MUX/MUSH/MU* development system
- mud
- mux
- mush
- python
An open source C++ game engine.
- gamedev
- game-engine
- 3d-game-engine
- 3d-graphics
Modern C++ library for the development of real-time graphical applications
Multiplayer top-down shooter made from scratch in C++. Web version: https://play.hypersomnia.io Made in 🇵🇱
- game
- free-software
- top-down-shooter
- shooter-game
The open-source studio for making games with AI. Your own one-person game studio. Everything you need to make games with AI, in one app. Game canvas. Bring your own key.
- ai-coding
- ai-coding-agent
- ai-game-design
- ai-game-dev