Plasma was started 12/12/04, and version 0.5 was released 1/5/06, so its been spanning 3 years of development. Most off the work has been done by Bill Orr, and Chris Clark, though Shan Zhou was involved in som early coding.
Plasma is the ultimate plotting program. It uses opengl to render complex time based mathematical expressions in 2 and 3 dimensions.
Please take the time to try it out: Installer Or you can review the source.