Siebel GNU Tools provides several small programs (most of them scripts) created to deal with different categories of problems when working with Siebel applications.
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.
A deduplication based filesystem for Windows and Linux (SDFS)
PDNS is an advanced high performance authoritative nameserver