Zplot is a little plotting tool I wrote because I was sick of hacking postscript by hand, and I was sick of the limitations of gnuplot. It is written in 100% pure Tcl, which is a little programming language most of you probably don't even know.
Zplot has one simple goal: to produce beautiful encapsulated postscript graphs of two-dimensional data. That's it! It is probably not as good as ploticus, but it is a lot simpler to understand if you want to hack around in it: only about 5,000 lines of Tcl (instead of more than 60,000 lines of C in ploticus).Here is more information if you are curious:
Enjoy! If you do end up using Zplot, please let me know. I'd love to include any graphs you make in the examples gallery.