Authentik

authentik is an open-source identity provider you host yourself, built for platform and security teams who would rather operate the login layer than rent one. It speaks SAML, OAuth2/OIDC, LDAP and RADIUS, so an aging internal tool and a modern web app can sit behind the same login instead of each keeping its own user table.

Installation splits by scale: Docker Compose for small or test setups, the official Helm chart on Kubernetes for larger ones, with AWS CloudFormation templates and a one-click DigitalOcean Marketplace listing also documented. Screenshots in the repository show both an end-user application portal and an admin interface, in light and dark themes. A paid enterprise edition exists for organizations replacing an incumbent IdP such as Okta, Auth0, Entra ID or Ping Identity, while the core is MIT licensed and written mostly in Python.