Firewall Related Links
Distributed Intrusion Detection System - Compiles firewall
logs from people and compiles hacking attempt statistics.
SNORT for Windows, Linux, OSX and more
Snort is a lightweight network intrusion detection system,
capable of performing real-time traffic analysis and packet logging
on IP networks.
TUCOWS: Don't forget to check TUCOWS list of software
for firewall tools. They have many!