"Rapid Rig: Modular" is a powerful automated rigging tool developed by Dustin Nelson and available for $90 at Highend3D.com.
Rapid Rigdoes what the name suggests - it allows you to build rigs rapidly, with speed and efficiency.
And it doesn't just rig bipeds. Rapid Rig will allow to rig characters with "four arms, two heads, twenty eyes, fourteen fingers, eight legs" - you get the picture. And all without having to understand anything much about rigging.
