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.
Lomalarga is a VPN-like service based on SSH and Linux.