ANIM8OR
It rules
I have it and It´s 100% free, easy to learn/use.
It has good renderer too!
GO.
www.anim8or.com
There´s also a forum, where toy can ask help :wink:
ALSO I have made a tutorial to making cars, but it´s little old, because new version of Anim8or(Beta 0.9) has edge extrude
See my tutorial:
http://www.freewebs.com/rdanim8or/