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Tiki Wiki CMS Groupware

Joomla is a free and open-source content management system written in PHP. The CMS is built entirely by volunteers from all over the world and has a strong community that provide educational resources, and extensions. 

MODX is a free, open source content management system and digital experience platform. The CMS gives you full control over your creative, editorial vision and the experience you deliver. MODX is written in the programming language PHP and supports both MySQL and Microsoft SQL Server databases. The CMS is openly developed and released under the GPL license, and allows contribution.

PyroCMS is a free and open-source Content Management System written in PHP on top the web development framework Laravel.

Free open source software combining the best of wiki and CMS with community building-features.

MediaWiki is a free and open source wiki engine used by thousands of organizations and websites across the globe. It's the software that powers Wikipedia, which was released as a free and open source project under the name MediaWiki, a year after the release of Wikipedia. The software allows people to collect and organize knowledge in cooperation with one another, and make it available on the web. MediaWiki is now built by a community of open source developers and provides plugins can be used to extend the software further. Allowing sister sites like Wiktionary, Wikimedia Commons and Wikidata to utilize the same code base.

With Wiki.js you can run a blazing fast Wiki built with performance in mind. Wiki.js is an extensible, free and open source Wiki software written in JavaScript. Wiki.js brings a modern approach to documentation and Wiki writing, it provides a simple to use WYSIWYG editor, a Markdown editor and a visual builder to please all types of workflows. All content moderation is also tracked on a Wiki.js-powered site, which means that you can an revert to a previous state or recover a deleted page at any time and get a broad overview of content evolution. Allowing you to visually compare two versions of the same page to see exactly what changed. Wiki.js runs on virtually any platform and is compatible with either PostgreSQL, MySQL, MariaDB, MS SQL Server or SQLite.