Azure Active Directory vs FreeIPA

FreeIPA is an integrated Identity and Authentication solution for Linux/UNIX networked environments. A FreeIPA server provides centralized authentication, authorization and account information by storing data about user, groups, hosts and other objects necessary to manage the security aspects of a network of computers.

It is a comprehensive identity and access management solution that gives you a robust set of capabilities to manage users and groups. You can get the reliability and scalability you need with identity services that work with your on-premises, cloud, or hybrid environment.