OSI-licensed only · self-hostable
GitBook is a hosted documentation platform: write pages, organise them into a book, publish a polished site. Open-source alternatives are mostly docs frameworks that build a static site from Markdown, plus a few wiki-style tools with a built-in editor.
Every tool below is under an OSI-approved licence (MIT, BSD-2-Clause, MPL-2.0 or AGPL-3.0), checked against its repository. Outline, a popular wiki often called open source, is listed separately because it uses the Business Source License. Material for MkDocs is also left out because its README announces an end-of-life date.
Licences checked against each repository on November 7, 2026.
| Tool | Best for | Licence | Runs as |
|---|---|---|---|
| Docusaurus | React-based docs and product sites | MIT | Desktop app |
| MkDocs | Simple Markdown docs with one config file | BSD-2-Clause | Desktop app |
| VitePress | Fast Vue-powered docs | MIT | Desktop app |
| Starlight | Docs site on Astro | MIT | Desktop app |
| mdBook | Book-style docs from Markdown | MPL-2.0 | Desktop app |
| Docsify | Docs with no build step | MIT | Desktop app |
| Fumadocs | Docs for React and Next.js apps | MIT | Desktop app |
| Docmost | Collaborative wiki with a browser editor | AGPL-3.0 | Docker |
Best for: React-based docs and product sites
A project for building, deploying and maintaining open source project websites. Code is MIT; the documentation is CC-BY-4.0.
Best for: Simple Markdown docs with one config file
A static site generator for project documentation. Write Markdown and configure the site in one YAML file.
Best for: Fast Vue-powered docs
A Vue-powered static site generator, built on Vite, and the spiritual successor to VuePress.
Best for: Docs site on Astro
A documentation website framework for Astro.
Best for: Book-style docs from Markdown
A utility to create modern online books from Markdown files, written in Rust and described as an alternative to GitBook.
Best for: Docs with no build step
A documentation site generator that converts Markdown to a website without requiring a build step.
Best for: Docs for React and Next.js apps
A framework for building documentation websites in React.js frameworks and Astro.
Best for: Collaborative wiki with a browser editor
An open-source collaborative wiki and documentation tool with real-time editing, diagrams, permissions and page history. Enterprise code in ee folders is under a separate licence.
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| If you need… | Start with |
|---|---|
| Docs next to code in Git | Docusaurus, MkDocs or VitePress |
| Astro or Next.js project | Starlight or Fumadocs |
| Simple book from Markdown | mdBook |
| No build tooling at all | Docsify |
| A browser editor for the whole team | Docmost |
Public source code, but under licences the Open Source Initiative doesn't approve. Fine to use; read the terms first.
Source code is public and self-hosting is possible, but the Business Source License 1.1 is not an open-source licence.
Quick answers to common questions
GitBook's hosted product is proprietary. The tools here are the usual open-source ways to produce a similar docs site.
MkDocs and Docsify are among the simplest: write Markdown and add minimal configuration.
Docmost provides a browser editor with real-time collaboration. The others are Markdown-in-Git workflows.
No. Its repository is under BSL 1.1, which is not an open-source licence, though the code is public.
Its README says it reaches end of life on May 5, 2027, so we did not list it as a long-term option.
List it on TechLogHub and we'll review it for this page.
