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
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
The ioquake3 community effort to continue supporting/developing id's
Cross-platform 2D and 3D game engine with modular architecture
A modular Common Lisp game engine
Open game and rendering engine packed into a JavaScript framework
The Tiny JavaScript Game Engine That Can!
Ct.js is a desktop game engine that makes learning programming fun
A Flutter based game engine
Python MUD/MUX/MUSH/MU* development system
2D JavaScript Physics Engine
Open source library for creative expression on the web, desktop, etc.
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Stride (formerly Xenko), a free and open-source cross-platform C# game
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
Game engine supporting many 3D/2D formats and graphic effects
PyCAPGE - Python Classic Adventure Point and Click Game Engine