The free animation and rigging script
DUIK has been updated and is now available. Not only does this super useful script help animators who use After Effects set up IK (inverse kinematic) rigs, it also includes many handy work-flow tools and expressions, for example, being able to select multiple key-frames on different layers, and copy paste them without creating new layers, that is just one tiny thing among others that even non character animators would want. Sure there are plenty of commercial animation assistant scripts out there, but DUIK is free, widely used and well tested.