Arc tracker for Maya. Equivalent of DTools for 3ds max.
Rigging tools from Unreal Engine.
Great podcast with Ken Fountain and his beginning as an animator.
And finally, I found this really good tip on Twitter.
#animtip The lower lid has no muscle to pull it DOWN, but it does have one that raises it. It only moves down when the eye pushes it down.
— On Animation (@DanOnAnimation) March 23, 2014