28 Apr
2010
28 Apr
'10
5:23 p.m.
The underlying technologies I've seen thrown around are Google Analytics, Cacti, Munin, RRDtool, and Nagios. Open source is desirable but not at the expense of critical features.
I don't know much about this, but I can at least add another OS tool to consider: http://piwik.org/ that we use for one site. HTH