Just found it, there is something nice about it...
http://creature.kestrelmoon.com/
Creature is the Cutting-edge 2D Animation Software designed to add stunningly fluid animation to your digital content. Take advantage of Creature's Directable Automated Animation Engine and powerful workflow to produce amazingly complex animation in an incredibly easy and time-efficient manner. Creature is the ideal animation Tool for game developers, digital artists and web designers wanting to add that special animated magic to make your content come alive.