Sculptris: a free 3D modeling software
The 3D modeling software are quite expensive in the trade, but nothing prevents you devote to this art for free. Indeed with Sculptris you’ll be able to model in 3D without spending a penny!
Once the software is installed, you start a new template, create objects by drawing, enhanced with tools to rotate, inflate, smooth or flatten. Import and export objects, view your model from different camera angles and ask advice to users on the forums of Sculptris.com, etc … While this may not be the best 3D modeling software but it is an excellent alternative Free. 
