Monitoring

http://www.opennet.ru/base/net/24hours_mon.txt.html how to graph using snmp-netgraph, gd, php, and database (in russian)

http://www.shrubbery.net/rancid/ RANCID monitors a router’s (or more generally a device’s) configuration, including software and hardware (cards, serial numbers, etc) and uses CVS (Concurrent Version System) or Subversion to maintain history of changes.

http://www.netxms.org/screenshots/ Cool monitoring system with web/ windows management console / pocket pc access

http://munin.projects.linpro.no/ nterface. Its emphasis is on plug and play capabilities. After completing a installation a high number of monitoring plugins will be playing with no more effort.