OpenSource Scientific Plotting Packages

I've collected a table of existing open source plotting packages I've found, with emphasis on 3d plotting and plotting libraries. Most of these libraries are hosted on SourceForge. I've only put programs that I was able to compile and run on my system.
Package URL Platform Features Language(s) Notes
Linux Un*x Windows OS X 3d library
gnuplot http://gnuplot.sourceforge.net/ yesyesyes?yesyes? ? a long-standing open-source plotting package. it is used as the plotter for octave
PLplothttp://plplot.sourceforge.net/yesyes??yesyes C, Xsimple and fast
MayaVi http://mayavi.sourceforge.net/ yes?yes?yesno? VTKvery pretty plus lots of capabilities. can't be used as a library [?]
MeTa->phi http://metaphi.sourceforge.net/ yes?no?yes yes?openGL, SDLvery pretty and seemingly fast
g2 graphical library http://g2.sourceforge.net/ yesyesyesno? noyesC2d plotting library
xplot http://mathdev.sourceforge.net/ yesyesyes?yes?openGL buggy behavior on first investigation. no 2d?
GLPlot http://glplot.sourceforge.net/ yesnononoyes?yes multiple Many dependencies...wouldn't compile on my system! Gnome based