Next Generation Open Source Firewall
Firewall log analyzer
Free UTM appliance: firewall, VPN, WAF and antivirus in one ISO.
Anti Spam SMTP Gateway
Web application firewall in C language uses libevent
A powerful network security tool, easy, safe and totally free.
Network Firewall Linux Kernel Module with Conflict Resolution Engine
Linux firewall distribution geared towards home and SOHO users.
A MAC address based user authentication system for campus-wide network
a secure, open source OS for use inside USEagency facilities