Imperva SecureSphere - Get the flexibility, reliability, and performance you need to protect your business. SecureSphere covers you both on-premises or in the cloud.
AWS WAF - AWS WAF is a web application firewall that helps protect your web applications from common web exploits.
ModSecurity - ModSecurity is an Open Source web application firewall developed by Trustwave's SpiderLabs.
Barracuda Web Application Firewall - Barracuda Web Application Firewall offers security and DDoS protection against automated & targeted attacks.
Sucuri - Website Protection, Malware Removal, and Blacklist Prevention
FortiWeb - FortiWeb is a web application firewall platform that helps you protect your company’s most critical web apps and APIs from malicious attacks.