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Open Source Authorization & Permissions Tools

A curated collection of the best open source systems for defining and enforcing access control policies..

Keycloak

Secure authentication and access control made simple

  • Stars

    37,475

  • Last commit

    7 hours ago

  • License

    Apache-2.0
Comprehensive open source identity management solution offering single sign-on, social login, and fine-grained authorization for applications and services.

Open Source Alternative to:

Auth0

Authentik

Take control of your identity with a secure, flexible solution

  • Stars

    26,051

  • Last commit

    3 hours ago

  • License

    MIT
authentik is an open-source identity provider that offers self-hosted authentication, authorization, and user management for businesses of all sizes.

Open Source Alternative to:

Auth0

Zitadel

Secure, customizable identity infrastructure for developers

  • Stars

    15,391

  • Last commit

    2 hours ago

  • License

    AGPL-3.0
ZITADEL provides a comprehensive identity management solution with easy APIs, customizable workflows, and serverless deployment options.

Open Source Alternative to:

Supabase

Ory

A certified and battle-tested identity solution

  • Stars

    13,934

  • Last commit

    3 months ago

  • License

    Apache-2.0
Ory is a certified and battle-tested identity solution backed by a large open source community and trusted by Fortune 500 companies.

Open Source Alternative to:

Auth0

Hexclave

Modular auth, payments, emails, and analytics for your product

  • Stars

    6,878

  • Last commit

    21 hours ago

  • License

    Unknown
Self-hostable platform combining user auth, payments, email, and analytics into modular building blocks that fit around your existing product.

Open Source Alternative to:

Auth0

Permify

Build scalable authorization in minutes, not months

  • Stars

    5,967

  • Last commit

    14 hours ago

  • License

    AGPL-3.0
Open-source authorization service for implementing fine-grained access controls. Centralized, scalable solution supporting RBAC, ABAC and ReBAC with Google Zanzibar-inspired architecture.

Open Source Alternative to:

Auth0

Cerbos

Secure, policy-based access control for modern applications

  • Stars

    4,631

  • Last commit

    6 hours ago

  • License

    Apache-2.0
A scalable authorization layer that provides fine-grained access control through externalized policies, enabling secure and flexible permissions management.

Open Source Alternative to:

Auth0
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