FreeIPA - FreeIPA is an integrated security information management solution combining Linux (Fedora), 389...
Keycloak - Open Source Identity and Access Management for modern Applications and Services.
OpenLDAP - OpenLDAP Software is an open source implementation of the Lightweight Directory Access Protocol.
Okta - Enterprise-grade identity management for all your apps, users & devices
Microsoft Active Directory - Active Directory is a special-purpose database \ 8212; it is not a registry replacement.
Amazon Cognito - Amazon Cognito lets you add user sign-up, sign-in, and access control to your web and mobile apps quickly and easily. It scales to millions of users and supports sign-in with social identity providers and enterprise identity providers via SAML 2.0.