2-d plotting program, now distributed under the GPL. Used to be called Xmgr.

I have just started using it and my initall feeling is generally positive. It has a very nice GUI interface that allows fast plotting of multi-graph plots. The exciting thing about this program (unlike Super Mongo for example) is that it also has a command line interpreter. This makes the prospect of plotting shit loads of data not too daunting.

The homepage is now at
http://plasma-gate.weizmann.ac.il/Grace/

Documentation is still being written but there is quite a lot available at present.