Next Generation Open Source Firewall
Anti Spam SMTP Gateway
OWASP ModSecurity Core Rule Set (CRS) Project
blocklists for openbsd,freebsd,linux,iptables,bsd pf,pf,ipfilter
360-FAAR Analyze FW1 Cisco Netscreen Policy Offline Using Config/Logs
Extract and Convert Juniper Firewall Policies to CSV
Linux firewall distribution geared towards home and SOHO users.
pfck - pf check - organizes flow information by host
IOSec Addons are enhancements for web security and crawler detection
This tool locks down Linux and UNIX systems.
Easy to use firewall for linux beginners.