Yo Frankie!

"Yo Frankie! (code-named Apricot) is an open video game made by the Blender Institute, part of the Blender Foundation, originally scheduled for release in August 2008.[2] It is based on the universe and characters of the free film produced earlier in 2008 by the Blender Institute, Big Buck Bunny.[3] Like the Blender Institute's previous open film projects, the game is made using free software. Yo Frankie! runs on any platform which runs Blender and Crystal Space, including GNU/Linux, Mac OS X and Microsoft Windows."
At http://en.wikipedia.org/wiki/Yo_Frankie!.

Download page: http://www.yofrankie.org/download/.

Source files (characters, etc.): http://www.graphicall.org/yofrankie/game/chars/.