scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Orx: Data-Driven Game Engine
A free 3D game engine to create games and realtimes scenes for Windows
Fork of AbuseSDL to carry on development
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
DOOM / Heretic / Hexen source port with enhanced graphics and UI
2D Game Engine
Cross-platform 2D and 3D game engine
A fast, scalable, distributed game server engine/framework for C++
The second demo of my game engine.
Paintown is a 2d fighting game engine.
A C++ 3D game engine.
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
Gorgon Game Engine (GGE) is a C++ game engine that handles many tasks.
A very small multi-platform game engine for creating desktop games.
A simple WinAPI game engine