Keep Calm and Read the Friendly Manual :-)
Description:
Joomla is a popular open-source content management system (CMS) used to build websites and online applications. It offers extensive extensions, templates, and features such as multi-language support, search engine friendliness, and mobile compatibility, supported by a large global volunteer community.
Description:
Backdrop CMS is a free, open-source content management system derived from Drupal, designed for building modern, comprehensive websites with a focus on performance and usability. It offers an upgrade path from Drupal 7, extensive modules and themes, and a user-friendly interface, suitable for organizations of all sizes.
Description:
BookStack is a free, open-source platform for creating and organizing documentation and knowledge bases. It features a simple WYSIWYG editor, full-text search, diagram integration, multi-language support, and robust permission controls, making it suitable for team collaboration and personal use.