What is a CMS?
A CMS (Content Management System) is a software application that is used to create and manage digital content — your website (WCM) or enterprise content management (ECM).
What CMS is best?
For websites and blogs, 66% of the world uses WordPress.
What CMS does a website use?
CMSdetect.com
Is there a list of CMS?
CMSdetect.com has a very good list.