Zitadel

ZITADEL is an open-source, cloud-native identity and access management (IAM) platform built for developers that simplifies authentication, authorization, and user management for modern applications. Founded in Switzerland by identity and infrastructure veterans, ZITADEL emerged to remove enterprise identity management as a barrier to innovation, providing a platform that scales with customers' needs through support for OAuth 2.0, OpenID Connect, SAML, and passkeys. With over 10,000 GitHub stars and 200+ contributors, ZITADEL is offered both as a self-hostable open-source project and as a managed cloud service, enabling teams to avoid vendor lock-in while meeting complex enterprise IAM requirements.