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
Lightspeed 3D
Lightspeed 3D is a realtime 3D engine for MacOS. It is available in source code form, with free licensing, and it's optimized for the PowerPC. It's lightweight enough to add to an existing application that just needs some quick 3D rendering, yet powerful enough to form the central graphics engine for commercial-quality games.
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