Intelligently block brute-force attacks by aggregating system logs
Firewall log analyzer
Anti Spam SMTP Gateway
A simple, portable port scanner
ipset set listing wrapper script
360-FAAR Analyze FW1 Cisco Netscreen Policy Offline Using Config/Logs
Programmable completion code (bash) for ipset (netfilter.org)
High interaction honeypot solution for Linux based systems
Easy to use firewall for linux beginners.
iptables web interface