authentik

authentik is an open-source Identity Provider (IdP) built for modern Single Sign-On (SSO). Supporting SAML, OAuth2/OIDC, LDAP, and RADIUS, it allows organizations to securely unify and manage identity. It features a highly customizable flow builder for custom authentication, enrollment, and MFA stages, making it scalable from small home labs to large enterprise clusters.

• Multi-protocol SSO support
• Flexible & customizable auth flows
• Built-in Multi-Factor Authentication
• Cloud-native deployment via Docker/Helm
• Enterprise-grade IdP alternative