Povray - Open Source

Contains many small macros that can help in many situations to save time and nerves.

Allows to create complex animations with many objects without fighting against clock and clock_on.

The only macro in this package so far creates a pigment for the sky-sphere. The result is a photorealistic background of the Milky Way as seen with the naked eye at a dark observation site. It is based on high-resolution images from NASA, nothing is generated with geometric objects.

Simple macros to show background-starfield, the sun and some planets.

Small, ugly, fast to render spacecraft with some nice functionality.