They all share a common ancestor (B-Human branched from the same as NaoTH; Northern Bites branched from B-Human, and Austin Villa branched from Northern Bites, if I'm correct).
Investigate which modules ought to work better than our current ones, and try to integrate them in our framework, as a replacement of our counterpart.
One of the things is to investigate how you can port motions (walking, kicking, standing up) or how we can use someone else's walking engine.