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[url=\"http://www.continuousphysics.com/Bullet/\"]Bullet[/url] is a 3D Collision Detection and Rigid Body Dynamics Library for games and animation.
Free for commercial use, including PlayStation 3, Open Source multiplatform C++ under the ZLib License.
Discrete and continuous collision detection, integrated into Blender 3D and COLLADA 1.4 Physics tools support.

ooo, very neat...if I had a use for it /cry.gif\' class=\'bbc_emoticon\' alt=\':(\' />