Firewall log analyzer
Free UTM appliance: firewall, VPN, WAF and antivirus in one ISO.
An iptables IPv4 firewall and traffic shaping program
Powerfull Web Application Firewall for PHP
Programmable completion code (bash) for ip[6]tables (netfilter.org)
360-FAAR Analyze FW1 Cisco Netscreen Policy Offline Using Config/Logs
High-performance WAF built on the OpenResty stack
ngx_lua_waf
Personal firewall for linux desktop and android phone