Back in February, Microsoft bought Caligari Corporation, the makers of the trueSpace 3D modeling software. They now have trueSpace 7.6 ready for release and it's free. You can download the software, instruction manual, and tutorial videos from their website. Registration required.

http://caligari.com/

Good time to inform about Blender.

http://www.blender.org/

http://en.wikipedia.org/wiki/Blender_(software)