List of free documentation stuff for developerππ½
If you're looking for all programming tools around documentation (not just free). Check this page List of documentation Programming Tools

DokuWiki
DokuWiki is a simple to use and highly versatile Open Source wiki software that doesn't require a database. It is loved by users for its clean and readable syntax. The ease of maintenance, backup and integration makes it an administrator's favorite.
Tag: note-taking, documentation
Free self-hosted Templates, themes, plugins, widgets
JS to Markdown
Generate code documentation with markdown automatically from js files!
Tag: documentation, markdown
Swimm
Swimm is a knowledge management tool for code, built for dev teams committed to effective knowledge sharing. With Swimm, every developer can quickly understand code and contribute to it.
Tag: documentation
1 private repo Up to 5 users Up to 30 verification tests per month*

Docsify-This
This web app provides a quick way to display Markdown files as standalone web pages (also perfect for embedding) without needing to setup your own website. All you need is a publicly available Markdown file and pass that URL to docsify-this.net.
Tag: documentation, markdown, website-builder
Tiddlyhost
Tiddlyhost is powered by TiddlyWiki the revolutionary open source JavaScript wiki.
Tag: documentation
Free self-hosted

Zeal
Zeal is an offline documentation browser for software developers.
Tag: learning-resource, documentation
Free self-hosted

Devdocs
DevDocs is an open source API documentation browser that combines multiple docs in a single web UI.
Tag: learning-resource, documentation

Notaku
Notaku turns your Notion workspace into beautiful websites. You will be able to use Notion as a CMS and easily update your knowledge base, blog, changelog and more.
Tag: blog, documentation, changelog
1k views / month 20 Notion pages per site notaku.site subdomain “Made with Notaku” banner

Docusaurus
An optimized site generator in React. Docusaurus helps you to move fast and write content. Build documentation websites, blogs, marketing pages, and more.
Tag: documentation
Open Source
Storybook
Storybook is a frontend workshop for building UI components and pages in isolation. Thousands of teams use it for UI development, testing, and documentation. It iss open source and free.
Tag: styleguide, documentation, design-systems, ui-component