Content Management System (CMS)
A CMS stands for Content Management System. It’s software that creates, edits, organizes, and publishes content on a website without needing to write code.
PHP has a lot of CMS. Here is a list:
WordPressTYPO3TextpatternSuluProcessWireoctoberCMSJoomlaDrupalBolt CMS
A CMS is a application that deals with publishing content online.
CMS may be open source or proprietary. They usually come with a marketplace, which publishes third-party plugins, extensions or components.
The list above is not exhaustive. It is in alphabetical order.