Badger is a multi-purpose program designed to make System Administrator tasks easier for all computer users. It is currently a Beta ready for testing. It currently runs on Mac and Linux. It must be run as root.
Secwatch is an intrusion detection system using log analysis to detect service scan and other brute-force attempts on a server or other computer using system logs and will create temporary firewall rules to block offending IPs
JDiag is an open source system information/diagnostics tool written in Java. It gathers information from various places in the system and places it into one log file for easy analysis by computer professionals.