Security Onion is a Linux distro for intrusion detection, network security monitoring, and log management. It's based on Ubuntu and contains Snort, Suricata, Bro, OSSEC, Sguil, Squert, ELSA, Xplico, NetworkMiner, and many other security tools. The easy-to-use Setup wizard allows you to build an army of distributed sensors for your enterprise in minutes!

Technical Infos & Links to Download: Security Onion

With this Linux distro, you can be an army of one !

NOTE: Best used to evaluate individual components; convenient since all tools included in distro.

The number of tools is ridiculous; configuration & admin of all the included tools is a full-time occupation.