OWASP Coraza WAF is a golang modsecurity compatible firewall library
A firewall for humans.
OPNsense is an open source, easy to use firewall and routing platform
360-FAAR Analyze FW1 Cisco Netscreen Policy Offline Using Config/Logs
A client for the MikroTik RouterOS API protocol, written in PHP.
flex-fw is a small and fast console frontend to iptables
KnockIt! is a port Knocking tool for MAC OSX