POV-Ray is a high-quality, totally free tool for creating stunning 3D graphics. It is available in official versions for Windows, Mac OS/Mac OS X and i86 Linux. The source code is available for those wanting to do their own ports.
debian deb packages
povray-doc - Persistence of vision raytracer (3D renderer) documentation
povray-examples - Persistence of vision raytracer (3D renderer) sample files
povray-includes - Persistance of vision raytracer (3D renderer) include files
povray - Persistence of vision raytracer (3D renderer)