Rigid Body Dynamics Simulators
Free for non-profit use
Open Dynamics Engine
Dynamic Animation and Control Environment
Multibody Dynamics Package
DYNAMECHS
--- A Multibody Dynamic Simulation Library
AERO
--- A Physically Based Simulation and Animation System
Robotics Toolbox for MATLAB
ROBOOP: A Robotics Object Oriented Package in C++
Abula
: Articulated Body Dynamics Using Low-complexity Algorithms
Commercial
Robotics FAQ
commercial robotics simulators
SD/FAST
Mechanical Dyanmics
--- FIGURE biological modeller
Havok
--- realtime interactive physics
Critical Mass
--- rigid body dynamics
mathengine
--- Karma physics simulation toolkit
Alias|Wavefront
Maya Dynamics