Blender

Blender is a powerful 3D image and animation edition program which must be highlighted because, in addition to a powerful engine and a good interface, it is totally free.

It offers a lot of options related with 3D modeling, animation, rendering, post-production, interactive creation and playback.

Furthermore, it has its own player which will let you preview your creations before and after saving them. That will give you more control over your creation.

Blender is totally free. Blender is an open source software. Available for all major operating systems under the GNU Public License.

Finally, it supports JPG, Iris, TGA, SGI, IFF, Inventor and a few more formats.