I’ve started to use gnuplot, which is a “command-line driven graphing utility.” It’s not open source but it is freely available (under some other license) and it’s been around since 1986. I don’t think it’s going to “go commercial” any time soon…
It’s proving challenging to understand gnuplot and get it to do what I want it to do, but I’ve tried using OpenOffice and Numbers and neither one can seem to plot 24,000+ data points. I considered updating my Perl code to write SVG files (and I may revisit that) but gnuplot seems to be the tool to use in this case…
Hopefully by the time I’ve collected a few more weeks worth of data I’ve got a better idea how to use gnuplot… but if you’ve got any pointers, I’d love to hear them.


Here’s the thirteenth (and final!) song from the album “Frenetic Stereoear” titled “Medium Rare Fidelity.”
