Siebel Monitoring Tools provides monitoring of Siebel servers through Nagios plugins and SNMP. It can monitor status of components, resource consumption (by component), task information, and anything else which might be interesting.
Open source project that offer summary and download services on this page is a project that carry out their development work on other open source development sites. Their work is linked to this page via a feature called OFI, and their work is not carried out here on OSDN site.