Gnuplot is a quite powerfull tool, if you know how to use it.
Here are some ideas how to realize solutions for different
problems. But these are only the few I took the trouble to write
Symbols and Line Types
I just plotted a overview of all the line types, colors and
gnuplot uses in the postscript terminal.
You are standing at the airport and you want to plot a complex function? You want to plot some data and you don't have a computer? No problem... use my gnuplot webinterface !
Additionally you can use it from your cell phone !