WAFW00F allows one to identify and fingerprint Web App Firewall
Cross platform web application firewall (WAF) engine for Apache
OWASP Coraza WAF is a golang modsecurity compatible firewall library
All-in-one solution for high performance web content delivery
Free UTM appliance: firewall, VPN, WAF and antivirus in one ISO.
Web security protection system based on openresty
Raptor - Web application firewall [ Stable version ]
Powerfull Web Application Firewall for PHP