For missing 2D graphs use the feature-request page on sourceforge.
3D support will follow after the release 1.0.0. See for more infos the road map site.
To install OctPlot you need additionally some prerequests:
For more instructions please read the files readme.xxxxx where xxxxxx is one of the above OSes. Be carefull with Cygwin, gcc-3.4 won't work.
for installing OctPlot go the way: