Barracuda Web Application Firewall - Barracuda Web Application Firewall offers security and DDoS protection against automated & targeted attacks.
StackPath - Secure Content Delivery Network, DDoS, WAF Service
AWS WAF - AWS WAF is a web application firewall that helps protect your web applications from common web exploits.
Flexera Software Vulnerability Manager - Flexera Software Vulnerability Manager provides solutions to continuously track, identify and remediate vulnerable applications.
ModSecurity - ModSecurity is an Open Source web application firewall developed by Trustwave's SpiderLabs.
Avast - Avast security software products are developed for Microsoft Windows, Mac OS X, Android and Linux users by AVAST Software.