POV-Ray (whose initials stand for Persistence of Vision Raytracer) is a high quality tool for creating 3D graphics.
It is a very complete work pack, and is better than others for two fundamental aspects: first because you can download it totally for free; and second because the code for POV-Ray is open, which means you can modify it, adapt it to your needs, or compile it in any platform.
POV-Ray is one of the most used graphic resources in the distinct communities of 3D graphics development. It has a very accessible interface and endless editing resources which you can discover for yourself very quickly.