Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies
ModSecurity - ModSecurity is an Open Source web application firewall developed by Trustwave's SpiderLabs.
nginx - A high performance free open source web server powering busiest sites on the Internet.
AWS WAF - AWS WAF is a web application firewall that helps protect your web applications from common web exploits.
vCenter Server - IaaS platform for managing and deploying virtual machines
Barracuda Web Application Firewall - Barracuda Web Application Firewall offers security and DDoS protection against automated & targeted attacks.