WPhysics engine
WAlgodoo
WAlgoryx Simulation AB
WBox2D
WBullet (software)
WCUDA
WDigital Molecular Matter
WHavok (software)
WNewton Game Dynamics
WNext Limit Technologies
WOE-Cake!
WOpen Dynamics Engine
WParticle system
WAlgodoo
WPhysics Abstraction Layer
WPhysX
WPhyz
WRagdoll physics
WRealFlow
WSimulation Open Framework Architecture
WSoft-body dynamics
WTokamak (software)