Best 8 Open Source GitBook Alternatives in 2025

Fern is a platform that automatically generates SDKs and API documentation from your API definition. You provide your OpenAPI, AsyncAPI, or gRPC specification, and Fern creates ready-to-use client libraries in languages like TypeScript, Python, Go, Java, Ruby, C#, PHP, and Swift.

Docusaurus is a static site generator built with React and Node.js. It takes your Markdown files and creates a complete documentation website with all the features users expect. Unlike building a website from scratch, Docusaurus handles the hard parts for you.

Astro Starlight is a documentation theme built on the Astro web framework. It provides a ready-made structure for creating documentation websites that are fast, accessible, and easy to maintain. Unlike other documentation tools, Starlight ships minimal JavaScript to the browser, resulting in faster load times and better performance.

MkDocs is a documentation generator that converts Markdown files into complete static HTML websites. You write your content in Markdown, which is a simple text format that anyone can learn in minutes. MkDocs then processes these files and creates a full website with navigation, search, and beautiful design.

Vrite is a content management platform designed specifically for technical writing. It offers a modern editor that works like familiar tools such as Notion, but adds features developers need. You can write in a visual editor while also having access to code blocks with syntax highlighting and formatting.

Fumadocs is a documentation framework that helps developers build professional documentation sites using React and Next.js. Unlike traditional documentation tools, it gives you complete control over your content and design while handling the complex parts automatically.

Scalar is a platform for building API documentation that looks professional and works smoothly. You provide your OpenAPI document, and Scalar transforms it into easy-to-read pages with examples and testing tools built in.

xyd is a documentation framework that lets you create professional documentation websites without wrestling with complex tools. It comes with six beautiful built-in themes you can use right away, or you can customize every part to match your brand. The framework automatically generates documentation from your OpenAPI, GraphQL, TypeScript, and React code specifications.