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Top Open Source Application Security Tools in 2026

A curated collection of the 7 best free and open-source Application Security tools in 2026. Compare features, GitHub stars, tech stacks, and self-hosted software.

  • Tirreno

    Open source security framework for threat monitoring

    Stars
    1,503
    Last commit
    23d ago
    License
    AGPL-3.0

  • Cerbos

    Fine-grained authorization for apps and AI agents

    Stars
    4,558
    Last commit
    10d ago
    License
    Apache-2.0

  • StatusScout

    Security and uptime monitoring for developers

    Stars
    15
    Last commit
    3mo ago
    License
    Open Source

  • ProjectDiscovery

    AI-powered security testing for continuously shipped software

    Stars
    30,869
    Last commit
    12d ago
    License
    MIT

  • Opengrep

    Open-source static code security engine

    Stars
    2,995
    Last commit
    12d ago
    License
    LGPL-2.1

  • Infisical

    End-to-end encrypted secret management platform for seamless integration and enhanced security in development workflows.

    Stars
    28,987
    Last commit
    11d ago
    License
    Open Source

  • ALTCHA

    Self-hosted, privacy-friendly CAPTCHA alternative with proof-of-work mechanism

    Stars
    2,710
    Last commit
    19d ago
    License
    MIT
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Showing 7 of 7 open-source tools