Procedural Locomotion: Automating human walk cycles using machine learning (github.com)

Does not look like human walking...

(slightly) Related: http://www.gdcvault.com/play/1020583/Animation-Bootcamp-An-I...

Really impressive animation generation using just a handful of keyframes and clever use of interpolation.

GaitSym is an awesome piece of open source software that has been used to model how dinosaurs walked, amongst other things.

http://www.animalsimulation.org/