The best Identity Management alternative to Microsoft Active Directory is Univention Corporate Server (UCS), which is both free and Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to Microsoft Active Directory and eight of them are Identity Management Tools so hopefully you can find a suitable replacement. Other interesting Identity Management Tool alternatives to Microsoft Active Directory are Microsoft Entra ID, SambaBox, JumpCloud and UniFi Identity (UID).
UCS is an open platform for central identity & access management, IT management, and active directory, with a web portal for easy access to applications.
Microsoft Entra ID (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.
SambaBox is an enterprise directory appliance with Web based management interface. SambaBox also offers integrated domain name (DNS), dynamic computer configuration (DHCP), certificate authority (CA), Microsoft Exchange compatible and also supports up to 2016 Functional Level...
Cloud-based directory services. Alternative to Microsoft Active Directory. Provides LDAP-as-a-Service, RADIUS-as-a-Service. Authenticates, authorizes, and manages employees, their devices and IT applications.
UniFi Identity (IDentity) or UID is an Identity-as-a-Service (IDaaS) platform that provides Cloud-based identity authentication and management services to enterprises.
Zoho Directory (ZD) is an identity provider that enables you to manage and secure your workforce's digital identity, through standards such as single sign-on (SSO) and multi-factor authentication (MFA).
A specialized extension of UCS for the education sector, providing centralized identity & access management, device & user management, and integration of school and cloud services via a web portal.
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it works flawless and it's free as long you don't need commercial support. Companies can get professional support from UCS or UCS Partners. It is the most complete alternative to MS ADS.