Jubjub is a decision tree based framework for automating *NIX administrative processes and reacting to events. Working well with a network monitor such as Nagios, you can expose, document, and add notifications to scripts in one step.
The SitRep project provides sysadmins with tools to quickly and easily list all machines on a net that match specific port criteria. It can be used to document (un)authorized servers and printers for maintenance and security reasons.