http://youtu.be/Bpi4J11ZE1o (fast forward a bit until that douchebag CEO is gone and the actual tech nerd appears

What is does is retarget animation data from one character to a completely different one, which would solve all the problem open-source game currently have with character animation... so if someone would write an open-source library for this it would be absolutely awesome

Probably there is some research paper one could base the lib on... I will search a bit later I guess.