best-of ranking · updated nightly

Best Open Source Security & Privacy Tools

Ranked by GitHub stars — actual adoption, not editorial taste. All 10 are free, open source and self-hostable; license and last activity on every entry.

1. 1
   PayloadsAllTheThings ★ 82K

   A list of useful payloads and bypass for Web Application Security and Pentest/CTF

   MIT Python pushed 2026-10-30 details →
2. 2
   Puter ★ 44K

   A full desktop environment that runs in your browser

   AGPL-3.0 TypeScript pushed 2026-11-02 details →
3. 3
   Mattermost ★ 40K

   Secure collaboration platform for mission-critical work

   NOASSERTION TypeScript pushed 2026-11-02 details →
4. 4
   Tailscale ★ 39K

   Zero-config VPN with WireGuard for secure networking

   BSD-3-Clause Go pushed 2026-11-02 details →
5. 5
   Keycloak ★ 38K

   Secure authentication and access control made simple

   Apache-2.0 Java pushed 2026-11-02 details →
6. 6
   HashiCorp Vault ★ 36K

   Secure storage and access control for secrets and sensitive data

   NOASSERTION Go pushed 2026-11-02 details →
7. 7
   Anthropic-Cybersecurity-Skills ★ 35K

   817 structured cybersecurity skills for AI agents · Mapped to 6 frameworks: MITRE ATT&CK, NIST CSF 2.0, MITRE ATLAS, D3FEND, NIST AI RMF & MITRE F3 (Fight Fraud

   Apache-2.0 Python pushed 2026-08-31 details →
8. 8
   pentagi ★ 33K

   Fully autonomous AI Agents system capable of performing complex penetration testing tasks

   MIT Go pushed 2026-10-22 details →
9. 9
   ProjectDiscovery ★ 33K

   Advanced vulnerability detection and management platform

   MIT Go pushed 2026-11-02 details →
10. 10
    JumpServer ★ 32K

    Secure access management for modern IT infrastructure

    GPL-3.0 Python pushed 2026-11-02 details →

last updated nightly · ranking method: github stars, live-tracked

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