You can also look up for these other topics: Framework Coding Standards Boilerplate CMS Tool Security Hacktoberfest
Modern, Crazy Fast, Ridiculously Easy and Amazingly Powerful Flat-File CMS powered by PHP, Markdown, Twig, and Symfony
Pagekit CMS
Home of the Joomla! Content Management System
Pico is a stupidly simple, blazing fast, flat file CMS.
A lightweight blog CMS for PHP
Craft is a flexible, extensible platform for creating bespoke digital experiences.
Drag and Drop Website Builder and CMS with E-commerce
Multilingual PHP CMS built with Laravel and bootstrap
MODX Revolution - Content Management Framework
Kirby's core application folder