Our Review:

Blender is the complete software package for 3D modelling, texturing, rendering, animation and physics. It has a complex but merciful user interface, and the entire repertoire of its capabilities are made available through a scripting language, so the creation of 3D games beckons.

The software can import from and export to more than 20 different file formats. There is a large and growing community of Blender users who've already contributed numerous add-on scripts that can make your going easier.

You'll find a generous number of fine tutorials to guide you up the steep learning curve of this monumental program, plus an active and helpful online user forum. If it can be imagined then it can be realized, with Blender freeware.