Package: wnpp There is no currently available graphing tool as nice as the ancient xgraph with its interactive zooming. A port to modern X is at http://www.cs.utoronto.ca/%7Eradford/xgraph.html and it's under a BSD license.
I'm going to upload xgraph shortly, ie without waiting the usual amount of time. (I need it on my machines here, and as long as it's packaged there's no sense delaying an upload.) If anyone else wants the package, please feel to take it over.