In 6 Days to Air, the documentary about the making of South Park episodes there is some great footage of the animators working on the characters in studio onw acom tablets. I couldn't tell what program it was. Does anyone know if it is a proprietary suite or something that can be purchased? I'd like to make my own cartoons, is there a comparable program one could look at working with that is available for mac?
From the Wikipedia article on South Park (which you could've found with a bit of Google):