bullet

3D collision detection and rigid body dynamics library

Bullet is a professional open source multi-threaded 3D Collision Detection and Rigid Body Dynamics Library. It is free for commercial use under the ZLib license. The library is being used by several professional game developers on PC, PlayStation 3, XBox 360 and Nintendo Wii. Sony Computer Entertainment provides a parallel SPU optimized version, and collaborations with IBM, Intel, AMD and NVidia to exploit their parallel hardware. Bullet is native part of Blender 3D modeler and it supports COLLADA Physics file format.