Gaming Engines
A Game Engine is the core software component of a video game. It typically handles rendering and other necessary technology, but might also handle additional tasks such as game AI, collision detection between game objects, etc. The most common element that a game engine provides is graphics rendering facilities (2D or 3D).
From : en.wikipedia.org/wiki/Game_engine
Lightfeather
Lightfeather is an open source 3D Engine for MacOSX, Windows and Linux.
The zlib/libpng license under which it is distributed allows you to use it for any purpose whatsoever including commercial projects without the need to redistribute your changes in any form or even mentioning that you use it (although that would be nice, of course).
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