A free 3D game engine to create games and realtimes scenes for Windows
Cross-platform real-time strategy game (3D)
An isometric arcade-style game of skill, puzzles and exploration
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
3D-Accelerated open-source DOOM engine
3d Reversi game
Turn based Civ-like strategy game
A version of the classic game Snake with some unique twists
action/combat flight sim
Scriptable frontend for media applications.
Pear3DEngine is a modern and modular 3D development framework