in reply to
Better plotting than GD::Graph?
As far as fonts go, if you have Freetype support in GD, you can (I believe) use any TrueType font in GD::Graph—depending on what degree of "nice" you're looking for, that might be sufficient to your needs. For nicer-looking lines, you might take a look at this patch on RT—it isn't included in the current version, but I am (*cough*) reliably informed that it's supposed to be in the next one, and it seems like it would solve your jaggies problem handily.
If God had meant us to fly, he would *never* have given us the railroads.