Best Open-Source Data Science Tools in 2026

A curated list of the best, top, and most popular open-source data science tools available right now. Showing the top 30 of 41 data science tools in our directory, ranked by GitHub stars.

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Frequently asked questions

What is the best open-source data science tool in 2026?

JavaScript Algorithms is the most popular by GitHub stars right now. A comprehensive collection of algorithms and data structures implemented in JavaScript, complete with explanations and additional reading links.

Are these data science 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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