Free game engine for development of desktop, mobile, and web games
The game engine for everyone
Fast and lightweight JavaScript game engine built on WebGL and glTF
Voxel game engine in C++ with OpenGL
The ioquake3 community effort to continue supporting/developing id's
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Cross-platform 2D and 3D game engine with modular architecture
A modular Common Lisp game engine
The Tiny JavaScript Game Engine That Can!
A Flutter based game engine
Ct.js is a desktop game engine that makes learning programming fun
2D JavaScript Physics Engine
Open source library for creative expression on the web, desktop, etc.
Stride (formerly Xenko), a free and open-source cross-platform C# game
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
A high-performance, industry-standard 2D physics engine built on Box2D
3D and 2D game engine written in Rust
A completely free, open-source, 2D game engine
Full featured MUD server with all the trimmings.
A 2D rigid body physics engine for the web
GemRB is a portable open-source implementation of the Infinity Engine
PyCAPGE - Python Classic Adventure Point and Click Game Engine
Game engine supporting many 3D/2D formats and graphic effects
SDL based generic 2D game engine
A cell-based puzzle game featuring classic and completely new puzzles