Cross platform web application firewall (WAF) engine for Apache
Fast and light-weight API proxy firewall for request and response
SKUDONET Open Source Load Balancer and Web Application Firewall
Next-generation and open-source Web Application Firewall (WAF).
CacheGuard Gateway is a UTM, a WAF, and a QoS management appliance.
Web security protection system based on openresty
NGINX compiled with NBS System NAXSI
Powerfull Web Application Firewall for PHP
Free Web Application Firewall