An OpenGL RTS game engine written in C
Xash3D FWGS engine
The flexible game engine
The ioquake3 community effort to continue supporting/developing id's
A completely free, open-source, 2D game engine
3D game engine/framework in C, with Luajit and Python bindings now
Go bindings for raylib, a simple and easy-to-use library
Game engine to build text adventures.
A modern, cross-platform Quake game engine based on FitzQuake.
Orx: Portable Game Engine
SDL based generic 2D game engine
A cross-platform, open-source, pure C game engine for mobile game
Retro game engine for creating games like it's 1997
a UCI chess engine
DOOM / Heretic / Hexen source port with enhanced graphics and UI
Cross-platform 2D and 3D game engine
Low-Level Game Engine for Retro Platforms
Game engine for playing tomb raider 1 - 5 levels.
An Adventure Game Engine