Zitadel

Zitadel is a Swiss open-source identity infrastructure platform founded in 2019. It provides developers and organizations with a complete solution for authentication, authorization, and user management. Zitadel supports modern auth standards including OAuth 2.0, OpenID Connect, and SAML, and offers features like multi-factor authentication, single sign-on (SSO), passwordless login, and fine-grained role-based access control. Unlike proprietary IAM solutions, Zitadel can be self-hosted for maximum data sovereignty, or used as a cloud service. It is designed for cloud-native applications and provides a powerful API and SDKs for multiple programming languages. As a European company operating under Swiss data protection laws, Zitadel is a strong privacy-respecting alternative to Auth0 or Okta.