pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies
Zentyal - Linux directory, domain, mail, gateway and infrastructure server for SMBs.
Microsoft IIS - Internet Information Services is a web server for Microsoft Windows
NethServer - NethServer is an operating system for Linux enthusiasts, designed for small offices and medium...
Apache HTTP Server - Apache httpd has been the most popular web server on the Internet since April 1996