Blender

Blender is an advanced, proffesional free 3D animating program. The program can be used for modeling and animating. It also features a built in game engine, where users are able to program their game. However no particle systems will work, and most physics are disabled. This is recommened only for games that are very basic.

For more information visit: http://blender.org

For useful tutorials, visit the following sites:

http://www.blenderguru.com/

http://cgcookie.com/blender/