Another perfect example of open source software gone commercial is Zenoss. As a full-featured network and service monitoring solution, Zenoss is one of the best monitoring tools available.
Most importantly, Zenoss combines two functionalities. First and foremost an enterprise environment requires host and service monitoring, with notifications. Network monitoring really means checking services, checking that hosts are up (they ping), and possibly writing your own plugins to check various other aspects of a server or network device. Until now, Nagios has filled that role.
Second, once a decent monitoring solution is in place, getting time-based information becomes desirable. Memory and CPU usage is the most prevalent example: if you’re checking available swap space every so often with Nagios, you may know when you start running low. But it may be just as important to see a graph of the last week’s usage. Tools like Cacti or Munin, which collect data frequently and use RRD graphs to display it, are very useful.
Zenoss fills both roles, without the annoying shortcomings prevalent in the alternative solutions. Zenoss uses the terms Availability Monitoring and Performance Monitoring to describe these two fundamental roles.
http://www.zenoss.com/
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