Microsoft Entra ID is described as '(formerly Azure Active Directory) is a comprehensive identity and access management cloud solution that provides a robust set of capabilities to manage users and groups' and is a identity management tool in the network & admin category. There are more than 25 alternatives to Microsoft Entra ID, not only websites but also apps for a variety of platforms, including SaaS, Self-Hosted, Mac and Windows apps. The best Microsoft Entra ID alternative is Keycloak, which is both free and Open Source. Other great sites and apps similar to Microsoft Entra ID are authentik, Kanidm, Amazon Cognito and Okta.