Tiger - The TIGER security tool Homepage
Tripwire - Open Source Tripwire software is a security and data integrity tool useful for monitoring and...
Lion - Accountability browser for the modern day
Ossec - OSSEC is an Open Source Host-based Intrusion Detection System.
Chkrootkit - Chkrootkit is a Linux tool to locally check for signs of a rootkit. It contains:
osquery - Utilities, Application Utilities, and Desktop Querying Tools