Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies
Freshservice - Freshservice: the one-stop cloud solution for all your IT management needs.
Microsoft IIS - Internet Information Services is a web server for Microsoft Windows
Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
LiteSpeed Web Server - LiteSpeed Web Server (LSWS) is a high-performance Apache drop-in replacement.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.