Rig On The Fly

We just announced Rig On The Fly an open source blender add-on that helps create animations more efficiently. It does so by giving the rigging power to the animator. The idea is simple, automatically create a small modular rig, animate, bake to skeleton, remove the created rig and repeat. No more need for counter-animation or monolithic rigs. You simply rig the part you are working on.

Find out more about it Here