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Open Source Blender Game Engine Overview

Blender is the open source, cross platform suite of tools for 3D creation.
Blender has its own built in Game Engine that allows you to create interactive 3D applications. The Blender Game Engine (BGE) is a powerful high-level programming tool. Its main focus is Game Development, but can be used to create any interactive 3d software for other things, such as interactive 3d architectural tours or educational physics research.
http://www.blender.org/