OWASP Coraza WAF is a golang modsecurity compatible firewall library
Next Generation Open Source Firewall
iptables mini-script in file-wizard
A java PCAP and DPI library
PeerGuardian - a privacy oriented firewall application
A client for the MikroTik RouterOS API protocol, written in PHP.
Linux firewall distribution geared towards home and SOHO users.
This tool locks down Linux and UNIX systems.
Personal firewall for linux desktop and android phone