Best Open-Source Security Tools in 2026

A curated list of the best, top, and most popular open-source security tools available right now. Showing the top 30 of 60 security tools in our directory, ranked by GitHub stars.

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Frequently asked questions

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

Rustdesk is the most popular by GitHub stars right now. An open-source remote desktop application designed for self-hosting, as an alternative to TeamViewer. It allows secure remote access and control while providing the flexibility and security of a self-hosted solution.

Are these security 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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