3D Procedural Modelling and Procedural Texturing Tool in OpenGL/C++
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
3D C++ Game Engine - yet another open source game engine
VR-Optimized ATC/Radio Plugin for X-Plane + FlyWithLua
Cross-platform 2D and 3D game engine
Minima is an homage to the 8-bit Ultima games
3D-Accelerated open-source DOOM engine
EDGE is an advanced DOOM source port
A 3D Game Framework
3d Reversi game
Turn based Civ-like strategy game
A powerful HTML, C#, PHP editor for windows
A cross-platform, 3D interpreter to play LucasArts' Lua-based games
2d/3d Game Engine
Babylon 5 in Homeworld 2!
A Lua Game Engine
A version of the classic game Snake with some unique twists