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Zenoss
What is Zenoss?
The Zenoss project provides an integrated, easy-to-deploy and cost-effective opensource alternative for enterprise IT infrastructure monitoring. Unlike the big OSS companies (IBM, HP, CA, BMC, Amdocs) we are able to keep costs down and directly involve end users throughout the world. More details can be found here.
http://www.zenoss.com/about/

Zenoss Core

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Zenoss Core is an award-winning open source IT monitoring product that effectively manages the configuration, health and performance of networks, servers and applications through a single, integrated software package.
The most popular IT Management project on SourceForge.Net Zenoss software has been downloaded over 750,000 times and deployed in over 18,000 organizations in over 175 countries.