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A free 3D game engine to create games and realtimes scenes for Windows
An isometric arcade-style game of skill, puzzles and exploration
Cross-platform real-time strategy game (3D)
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
3D-Accelerated open-source DOOM engine
Turn based Civ-like strategy game
3d Reversi 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
A 3D rendering / entity engine