Ploticus, a graphing program

In looking at the post about notepad++ and aspell, I was checking to see if aspell could be open source and repackaged.

Besides that, their graph was done with Ploticus, a graphing program. Seemed neat.
Here is the url, http://ploticus.sourceforge.net/doc/welcome.html

Does anyone else have a good portable graphing program, or made a .paf for it?