What is the easy-to-use 3D computer graphics software?
http://www.blender.org/ Blender is the free open source 3D content creation suite, available for all major operating systems under the GNU General Public License. “Easy-to-use” and “3D computer graphics” don’t belong in the same sentence. Blender is as close as you will get. Edit: There are a lot of tutorials too (since it’s free) so that will make it a lot easier to get started.