OWASP Coraza WAF is a golang modsecurity compatible firewall library
OpenBSD based firewall distribution
A simple, portable port scanner
Provisions Simple Secure Network Firewall/Router
shell program to automatically configure freebsd as a firewall
360-FAAR Analyze FW1 Cisco Netscreen Policy Offline Using Config/Logs
A client for the MikroTik RouterOS API protocol, written in PHP.
Open source voucher management / hotspot system
Linux firewall distribution geared towards home and SOHO users.
A MAC address based user authentication system for campus-wide network