Best Open-Source Security Tools in 2026

Security tools in this directory cover authentication, password vaults, and privacy-focused storage. Authelia provides SSO and multi-factor access for web apps; Bitwarden Client Apps manage vault access across web, desktop, and CLI; Ente stores photos, videos, and 2FA secrets with end-to-end encryption. Arcjet-js adds bot detection and rate limiting for Node and related runtimes.

The most popular open-source Security tool by GitHub stars is Rustdesk(111.0k stars), followed by Sherlock(80.8k stars)and Caddy(71.5k stars). This page lists the top 30 of 60 security tools in the directory, ranked by community adoption.

Quick comparison

Best open-source Security tools in 2026, ranked by GitHub stars
#ToolStarsLanguageLicense
1Rustdesk

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.

111.0kRustGNU Affero General Public License v3.0
2Sherlock

Sherlock is a powerful tool to hunt down social media accounts by username across numerous social networks efficiently.

80.8kPythonMIT License
3Caddy

A fast and extensible multi-platform HTTP/1-2-3 web server with automatic HTTPS, providing easy configuration and built-in support for modern protocols.

71.5kGoApache License 2.0
4Ghidra

Ghidra is a comprehensive software reverse engineering (SRE) framework developed by the NSA, offering tools for analyzing various platforms.

55.3kJavaApache License 2.0
5Mkcert

A simple zero-config tool designed to create locally trusted development certificates for any domain, enhancing local SSL/TLS setup.

54.9kGoBSD 3-Clause "New" or "Revised" License
6Joplin

Joplin is a privacy-focused note-taking application that supports synchronization and is available on Windows, macOS, Linux, Android, and iOS.

54.3kTypeScriptOther
7HackingTool

A comprehensive all-in-one hacking tool designed for hackers, providing a variety of features for security testing and exploitation.

51.9kPythonMIT License
8Headscale

An open source, self-hosted implementation of the Tailscale control server, providing secure peer-to-peer networking capabilities.

37.3kGoBSD 3-Clause "New" or "Revised" License
9Mattermost

An open source platform for secure collaboration across the entire software development lifecycle.

36.2kTypeScriptOther
10Vault

A comprehensive tool for secrets management, encryption as a service, and privileged access management, providing high security and control.

35.4kGoOther

All 30 Security tools

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Frequently asked questions

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

Rustdesk leads by GitHub stars(111.0k). 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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