When I needed an open source monitoring solution some time ago I eventually went with Zenoss. Nagios felt a bit clunky. Zenoss had a (IMO) better structured web interface and also more options for log-filtering/monitoring. Also it's based on Python so easier for me to extend.
The only drawback of Zenoss is that it is a bit of a memory hog, which eventually became a problem as it was running on a cheap VPS...
Icanga does sound promising, as it looks like it redesigned Nagios from a bag of old perl scripts to a better-integrated solution.
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When I needed an open source monitoring solution some time ago I eventually went with Zenoss. Nagios felt a bit clunky. Zenoss had a (IMO) better structured web interface and also more options for log-filtering/monitoring. Also it's based on Python so easier for me to extend.
The only drawback of Zenoss is that it is a bit of a memory hog, which eventually became a problem as it was running on a cheap VPS...
Icanga does sound promising, as it looks like it redesigned Nagios from a bag of old perl scripts to a better-integrated solution.
There is Shinken as well (http://www.shinken-monitoring.org/features/) which promises 100% compatibility with Nagios plugins... plus is written in python (https://github.com/naparuba/shinken). Not sure about performance comparisons