The flexible 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
The ioquake3 community effort to continue supporting/developing id's
A modern, cross-platform Quake game engine based on FitzQuake.
Orx: Data-Driven Game Engine
A cross-platform, open-source, pure C game engine for mobile game
Retro game engine for creating games like it's 1997
DOOM / Heretic / Hexen source port with enhanced graphics and UI
Cross-platform 2D and 3D game engine
Game engine for playing tomb raider 1 - 5 levels.
A Simple Game Engine
3D game engine for C and C++
Tactical, turn-based game engine, that uses OpenGL and WinAPI
A complete 2D Game Engine with built in drag and drop editor
A DirectX based graphics/physics engine
Reference implementation for the Doom game engine.