CTA Text Area!
Integrating OpenManage Server Administrator with Nagios and Ganglia has been written up in Dell Power Solutions and in another article, Managing with OpenNMS was also covered.
Another frequently used application is HP's Systems Insight Manager (SIM). While the latest versions recognize Dell servers, the SNMP information (MIB) in the application may need to be updated to reflect the latest PowerEdge features as listed in the What's New section of the SNMP reference guide for that release. A good paper titled Integrating Dell PowerEdge Servers into an Environment Managed by HP Systems Insight Manager 5.0 goes into the details.