WhatCMS.org can currently detect the use of 100 different CMS applications and services.
What is a CMS?
A CMS or Content Management System is an application that can be used to manage and organize text, movies, pictures, links and many other types of data. Functionality varies from CMS to CMS, but most are web based and offer some sort of access control. Many of the most popular websites in the world use free and publicly available CMS' like Wordpress, Joomla and Drupal.