I use 3ds max but it's not that common because of the price(have it in school). But there is a free version called g max made for making game characters that supposed to be very good check out "www.discreet.com/products/gmax/gmaxconsumer/" for more info. More common used program is "true space" and "rhino". You could also check out Strata 3d that I think is a freeware. Hope this helps. If you have any more questions regarding this just let me know. Magnus