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
OpenSceneGraph
The OpenSceneGraph is an OpenSource, cross platform graphics toolkit for the development of high peformance graphics applications such as flight simulators, games, virtual reality and scientific visualization. Based around the concept of a SceneGraph, it provides an object oriented framework on top of OpenGL freeing the developer from implementing and optimizing low level graphics calls, and provides many additional utilities for rapid development of graphics applications.
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