Next Generation Open Source Firewall
An engine to make Tor network your default gateway
HTTP proxy to block ads and customize webpages
SKUDONET Open Source Load Balancer and Web Application Firewall
RazWall Firewall
Network Load Balancer and Application Security
Anti Spam SMTP Gateway
OWASP ModSecurity Core Rule Set (CRS) Project
High-performance WAF built on the OpenResty stack
Linux firewall distribution geared towards home and SOHO users.
IOSec Addons are enhancements for web security and crawler detection
Firewall/Proxy FreeBSD
Easy to use firewall for linux beginners.
Lomalarga is a VPN-like service based on SSH and Linux.