I’ve been trying to use gnuplot instead of Gd::Chart in my massif_grapher script, mostly just so it can generate zoomable postscript or SVG output.
I first tried using the Chart::Gnuplot perl API, but after a very helpful email conversation with its maintainer Ka-Wai Mak, we found that it cannot yet be used to create gnuplot’s “rowstacked” [...]

Glom has lots of code, lots of functionality and lots of UI. It’s easy to break things when making changes to the code. So Armin set up some initial Glom LDTP python scripts to check for regressions. These scripts try to actually use the UI and then check that the application worked as expected.
I’m sure [...]

Valgrind’s massif tool tracks how much memory an application uses over time, allowing you to see leaks. Previous versions produced pretty graphs. For instance, see the graph in this out-dated GNOME tutorial about massif.
However, massif’s behaviour has changed and those graphs are no longer generally appropriate. But they were nice. So I hacked a copy [...]