Here are the best free CAD software products that ... are created through Sculptris are pretty basic. You would need other products to refine the design. In case you are a student or a self ...

At its most basic this lets students create ... Tinkercad offers a free and powerful way to work with computer-aided design, ...

It allows for basically free, quick mock ups that you can hold in your hand. That last bit is important, because having something you can touch and see is a huge part of the design process.