Authentik
A versatile, open-source identity provider that unifies authentication and authorization. It serves as a modern 'authentication glue,' allowing organizations to secure virtually any application with SSO and MFA.
Identity & Access (IAM)
Keycloak
The open-source standard for Identity and Access Management (IAM), offering complete sovereignty over user data, federation, and SSO infrastructure without per-user licensing costs.
Zitadel
An open-source, API-first identity infrastructure platform for multi-tenant authentication and authorization, providing an alternative to Auth0 or Firebase.