Best Open-Source Documentation Tools in 2026

A curated list of the best, top, and most popular open-source documentation tools available right now. Showing the top 30 of 63 documentation tools in our directory, ranked by GitHub stars.

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Frequently asked questions

What is the best open-source documentation tool in 2026?

Computer Science is the most popular by GitHub stars right now. A comprehensive path to a free self-taught education in Computer Science, offering a structured curriculum and resources.

Are these documentation tools free?

Yes. Every tool on this list is open source and free to use in your own projects. Many can be self-hosted.

How is this list ranked?

Tools are ranked by GitHub star count, a strong proxy for community adoption and active maintenance. Star counts are refreshed regularly.

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