Warden - Alert your users when they're getting hacked
Apache HTTP Server - Apache httpd has been the most popular web server on the Internet since April 1996
nginx - A high performance free open source web server powering busiest sites on the Internet.
Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies
Istio - Open platform to connect, manage, and secure microservices
LiteSpeed Web Server - LiteSpeed Web Server (LSWS) is a high-performance Apache drop-in replacement.