Open-source wikis and knowledge bases

5 wikis and knowledge bases whose code is public under an OSI-approved license, rated for privacy with evidence. Picks first, then by score.

1. BookStack Grade B

   Self-hosted wiki platform that organizes documentation into shelves, books, chapters and pages. Built with PHP and Laravel, with a WYSIWYG and Markdown editor, search and role-based permissions.

   MIT. Source code

2. MediaWiki Grade C

   Wiki software developed by the Wikimedia Foundation that runs Wikipedia. Self-hosted PHP application with page history, templates, a visual editor and a large extension ecosystem.

   GPL-2.0-or-later. Source code

3. XWiki Grade C

   Self-hosted enterprise wiki written in Java, with structured data, scripting and an extension system for building wiki applications. Developed by XWiki SAS and its community.

   LGPL-2.1. Source code

4. Wiki.js Grade D

   Self-hosted wiki built on Node.js, with Markdown, visual and HTML editors, Git storage sync, full-text search and many authentication options.

   AGPL-3.0. Source code

5. DokuWiki Grade F

   Self-hosted wiki software written in PHP that stores pages in plain text files, so it needs no database. Includes access control, authentication connectors and a large plugin collection.

   GPL-2.0. Source code

Compare all 8 wikis and knowledge bases, open source or not.