It's neither open source, nor free, but I moved from Nagios/Groundwork to Solarwinds ipMonitor 9.
Solarwinds recently cut the price down to under $1000 for unlimited monitors. Up until about a year ago, the unlimited license ran about $5K. So for a large nationwide environment like ours, our ROI was pretty decent, but if you are only watching a dozen or two systems with maybe ten monitors each, Nagios would be the best bet. On Wed, 2009-07-22 at 13:40 -0500, Jack Bates wrote: > Matthew Huff wrote: > > Some of our requirements: > > > > . Native agents for Windows 2003/2008, Linux, Linux x86_64, Solaris > > Sparc and Solaris x86_64. Either binaries or source code. > > . Ability to send alerts via email, pager and/or snmp > > . Monitoring of OS properties like memory, disk, cpu, etc... > > . Ability to extend agents with scripting to allow monitoring of > > custom services > > . Plug-in architecture for third-party add-ons > > . Reliable Architecture > > . Reasonable user interface > > . Non-blocking polling > > . Active Project (New Releases on regular basis and have existed for > > a reasonable period) > > You probably have the list of the most commonly used. Each has good and > bad points. A few of them I believe are limited on using agents and > supporting external scripts. Several are considered Nagios on steroids, > using a Nagios core wrappered in a bunch of other OSS. Several, like > Zenoss are particular about the primarily monitoring system (though > agents might run on any OS). > > Jack > -- "Prediction is very difficult, especially about the future." Niels Bohr -- Ray Sanders Linux Administrator Village Voice Media Office: 602-744-6547 Cell: 602-300-4344