Master/node to gather and graph "everything" on your systems using Tobi Oetiker's rrdtool. It can optionally warn your surveillance software. This software package was originally called LRRD. The project. Please see http://munin-monitoring.org/
Graphical or terminal-based stopwatch with many user-named lap timers. Save / restore timing results via CSV file; timer "runs" even when application isn't running! Supports lap timer label templates. Hildonized (i.e., also runs on Maemo / Nokia 770).
GL O.B.S. is based around a PyGTK interface that launches OpenGL programs feeding them with a common CLI options set which will affect their behaviour, then receives back their statistical output. Benchmarks are easy to create and add.