Security Onion is a Linux distro for IDS (Intrusion Detection) and NSM (Network Security Monitoring). It's based on Xubuntu 10.04 and contains Snort, Suricata, Sguil, Squert, argus, Xplico, tcpreplay, scapy, hping, and many other security tools.
https://code.google.com/p/security-onion/