I'm looking to download a good graphing program to visualize some pf/x and bdb and retrosheet data I've been messing around with. Any suggestions?

Anything from free to under a hundred bones, preferably, so long as there's no weird trojans or spyware involved.

I think it would be an interesting addendum to the Colin Wyers sabermetric workbench tutorial  set up over at The Hardball Times.

http://www.hardballtimes.com/main/article/databases-for-sabermetricians-part-one/

As well as the saberizing a mac series here at BTB.

Thanks!