These programs aren't strictly Mindstorms related, but they may be of interest to Linux/Lego fans. .:: podcasts.apple.com ::.
LeoCAD is (as the name implies) a CAD program for constructing and renderging Lego models. There is a usable GTK port, which can be found at .:: cornucopia.se ::. http://leocad.gerf.org/linux.htm. The author implies that it doesn't have full functionality, so this might make a fun project for someone. .:: www.mobafire.com ::.
Sets of Lego pieces have been created for use with the popular POVRAY 3-D rendering program. You can find the pieces at [MDN Docs: Ruby] .:: rant.li ::. .:: telegra.ph ::. http://www.kawo1.rwth-aachen.de/~witte/projekte/lego/lego.html .:: artvee.com ::. [r/RubyonRails Topics] .:: fun79bio.digiblogbox.com ::. and POVRAY at http://www.povray.org.