Batman Beyond

Find out more about it here.

Bill The Sailor

Find out more about it here.

Drone Ship

You can download this rig directly from here (in zip form), thanks for Dharmin Doshi.

Black Panther

Head over to Turbosquid for the download link and if you want to see all the rigs he's offering (although the rest is not free, but cheap nonetheless), head over here.

Patrick

Not free, but not expensive either, check out the Patrick rig at longwinterstudios.com and watch the clips below: