WordPress is open source software you can use to create a beautiful website, blog, or app.
Drupal is a free software package that allows an individual, a community of users, or an enterprise to easily publish, manage and organize a wide variety of content on a website.
Grav is an easy to use, yet powerful, opensource CMS that requires no database. In a nutshell, installing Grav is a matter of unzipping the file.
MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia.
Joomla is an award-winning content management system (CMS), which enables you to build web sites and powerful online applications.
DokuWiki is a standards compliant, simple to use Wiki, mainly aimed at creating documentation of any kind. It is targeted at developer teams, workgroups and small companies.
Moodle is an open source tool for creating online dynamic web sites for their students. To work, it needs to be installed on a web server somewhere, either on one of your own computers or one at a web hosting company.
ProcessWire is a friendly and powerful open source CMS and CMF with an exceptionally strong foundation.
Hubzilla is a powerful platform for creating interconnected based websites featuring a decentralised identity, communications, and permissions framework built using common webserver technology. Hubzilla is very suitable for communities (of any size).
Squarespace is the all-in-one solution for anyone looking to create a beautiful website. Domains, eCommerce, hosting, galleries, analytics, and 24/7 support all included.
Strapi is the most popular open-source Headless CMS. Strapi gives developers the freedom to use their favorite tools and frameworks while allowing editors to easily manage their content and distribute it anywhere.
A powerful Open Source collaborative platform enhancing collaboration and communication.
Tiki Wiki CMS Groupware is a full-featured, web-based, multilingual (40+ languages), tightly integrated, all-in-one Wiki+CMS+Groupware, Free Source Software (GNU/LGPL), using PHP...
Simple Machines Forum — SMF in short — is a free, professional grade software package that allows you to set up your own online community within minutes.
django CMS is an Enterprise CMS built with Django and one of the most active open-source projects in the Django ecosystem. Since 2007 it powers tens of thousands of websites across the world, and benefits from a friendly developer community.