HTTP proxy to block ads and customize webpages
Next Generation Open Source Firewall
Anti Spam SMTP Gateway
RazWall Firewall
OWASP ModSecurity Core Rule Set (CRS) Project
High-performance WAF built on the OpenResty stack
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
Firewall/Proxy FreeBSD
Easy to use firewall for linux beginners.