You can never have enough content at your fingertips. More resources mean you can be more creative with your animations.
Here are some great free libraries suggested by Antics users:
Free motion capture
This is a massive library and I’ve imported a few of their animations with no trouble at all. If you find an animation that needs editing, why not use another suggestion – BVH Hacker
Another large library, I’ve found many useful .wav files here, and most seem to be in the correct format to drop straight into Antics
The same for textures to help customise your props