Math Software for Programers
This page lists some math software, tools, libraries, for programers. I've used half of them. For those i haven't used, i know that they have high quality.
Mathematica
POV-Ray
POV-Ray is a 3d-modeling and rendering software. You write a scene description file, then it generate a image file as output. Great for 3D math illustration.
See also: Requirements for a Visualization System