Blender is a free 3-D software that lets you create whatever model you want. Its difficulty is based on how well you know the hot keys. I like to use this program a lot with Garry's Mod to see how well I can make body armor or some kind of car part. I spend most of my time learning more about blender and what I can do with it.
Here they are, all 12 of them! These Maya rigs are perfect for honing in on body mechanics and acting as you develop your character animation skills. http://vimeo.com/joedanimation/bodymech. They will work with Maya 2014 and up, and come with an AnimSchool Picker that can be mapped to any of the rigs by changing the namespace within the picker ui. Happy Animating! Joe Daniels. http://artofjoe.blogspot.com. http://gumroad.com/joedanimation