Another major player I find the list missing is collectd and the plethora of various other RRD tools (even though Cacti and Nagios are there). But to be fair, his list seems ore of 'current snapshot' stats instead of logging and monitoring over long periods of times.
My collectd daemon on Ubuntu 8.04 dies almost once every two days -- anyone experiences the same (and happens to have a fix)?
Odd, it's running on all my servers for months straight. Could be a million possibilities, check the collectd log. If nothing, run it in non-daemon mode and have it write everything to a file manually.