libbulletdynamics2.81 2.81-rev2613+dfsg-3 (amd64 binary) in ubuntu saucy

 Bullet professional 3D Game Multiphysics Library provides state of the art
 collision detection, soft body and rigid body dynamics.
 .
 This package contains the BulletDynamics shared library.
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 It features fast and stable rigid body dynamics constraint solver, vehicle
 dynamics, character controller and slider, hinge, generic 6DOF and cone twist
 constraint for ragdolls.
 .
 For more information about Bullet, please refer to the libbullet-dev package.