The Asset Factory Auto Biped Rig has been in development since 2006. Great for cartoon and realistic animation, motion capture editing, and games.
Features
Ik/Fk Matching
Bendy/Stretchy
Squashing
Isolated Hips/Chest/Head
Space Switching
No Flip Twisting
No gimbal Lock
Custom Rotate/Orders
Compatibility
Available for Autodesk Maya
No plug-ins required
Motion Capture compatible*
Massive compatible*
Unity compatible*
aRFace compatible
aRPicker compatible