The ioquake3 community effort to continue supporting/developing id's
Cross-platform 2D and 3D game engine with modular architecture
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Magic Another Game Engine
Voxel game engine in C++ with OpenGL
Free game engine for development of desktop, mobile, and web games
Stride (formerly Xenko), a free and open-source cross-platform C# game
3D and 2D game engine written in Rust
JavaScript-based game engine designed to empower developers
dhewm 3 main repository
An easy to use 2D HTML5 game engine written in TypeScript
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Ct.js is a desktop game engine that makes learning programming fun
The Tiny JavaScript Game Engine That Can!
Open source library for creative expression on the web, desktop, etc.
A 2D rigid body physics engine for the web
Zig game engine & graphics toolkit
Python MUD/MUX/MUSH/MU* development system
A tool to easily transform Unreal Engine games into VR experiences
Full featured MUD server with all the trimmings.
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
A cell-based puzzle game featuring classic and completely new puzzles
The multiplayer game engine