OpenSnitch is a GNU/Linux port of the Little Snitch firewall
OWASP Coraza WAF is a golang modsecurity compatible firewall library
A high-performance MySQL proxy
Firewall log analyzer
An iptables IPv4 firewall and traffic shaping program
OWASP ModSecurity Core Rule Set (CRS) Project
360-FAAR Analyze FW1 Cisco Netscreen Policy Offline Using Config/Logs
High-performance WAF built on the OpenResty stack
ngx_lua_waf