Top 10 Best Opensource Knowledge Base Software of 2026

BookStack is a free, open-source platform designed for building and managing knowledge bases with a simple, book-like hierarchical structure of shelves, books, chapters, and pages. It features a clean WYSIWYG editor with Markdown support, powerful search, image galleries, attachments, and revision history. Self-hosted and extensible, it's ideal for teams needing private, organized documentation without subscription costs.

Wiki.js is a modern, open-source wiki platform built on Node.js, designed for creating knowledge bases, documentation sites, and collaborative wikis. It supports Markdown editing with real-time preview, Git-based version control, and storage in databases like PostgreSQL or MongoDB. With features like advanced authentication (OAuth, LDAP), asset management, localization, and a GraphQL API, it offers enterprise-level capabilities for teams.

Outline is a fast, modern open-source knowledge base designed for teams to collaboratively create, organize, and share documentation. It features a Notion-like editor with collections for structuring content, powerful full-text search across all documents, and granular permissions for secure access control. Deep integration with Slack allows users to instantly convert conversations into editable docs, making it ideal for turning ephemeral chats into persistent knowledge.

DokuWiki is a lightweight, open-source wiki software optimized for creating and managing documentation and knowledge bases without needing a database. It stores all content in plain text files, enabling seamless integration with version control systems like Git for easy backups and collaboration. With a simple wiki syntax, extensive plugins, and templates, it's designed for straightforward documentation workflows.

MediaWiki is the open-source wiki engine powering Wikipedia and numerous other collaborative platforms, designed for creating dynamic, version-controlled knowledge bases. It excels in handling large-scale content with features like full-text search, page histories, categories, and interwiki linking. Highly extensible via thousands of plugins, it supports everything from simple documentation wikis to complex semantic knowledge graphs.

XWiki is a powerful open-source enterprise wiki platform designed for creating and managing knowledge bases, collaborative documentation, and structured content repositories. It excels in extensibility, allowing users to build custom applications, structured pages with object-oriented data models, and integrate with numerous enterprise tools via its vast extensions marketplace. Primarily Java-based, it supports advanced features like versioning, full-text search, and granular permissions, making it suitable for complex organizational knowledge management.

TiddlyWiki is a free, open-source, single-file personal wiki that runs entirely in any web browser without requiring a server. It enables users to create interconnected notes called 'tiddlers' using a non-linear structure, supporting tagging, searching, macros, and plugins for extensive customization. Ideal for personal knowledge management, it excels in portability and offline use, though multi-user collaboration needs additional server setups like Node.js editions.

Raneto is an open-source, self-hosted knowledge base platform powered by Node.js and Markdown files, enabling users to create lightweight documentation sites without a database. It supports categories, full-text search, and customizable themes for organizing and presenting content effectively. Ideal for simple wikis or internal knowledge bases, it prioritizes simplicity and speed over advanced enterprise features.

phpMyFAQ is a mature open-source knowledge base and FAQ management system built with PHP and MySQL, designed for creating, organizing, and sharing structured information repositories. It supports advanced search, categories, attachments, user authentication, and multi-language content to facilitate customer support and internal documentation. The software includes features like RSS feeds, PDF exports, voting on answers, and integration with LDAP or single sign-on for enterprise use.

Documize is an open-source document management and knowledge base platform that enables teams to create, organize, and securely share documentation. It supports rich text editing, advanced search, categorization, and role-based permissions, making it suitable for internal wikis and collaborative knowledge sharing. The self-hosted community edition is free under AGPLv3, with enterprise options for additional features like workflows and integrations.