Active Directory (AD) is a directory service that Microsoft developed for Windows domain networks and included in most Windows Server operating systems as a set of processes and services.
Cost / License
- Paid
- Proprietary
Platforms
- Windows

389 Directory Server is described as 'Enterprise-class open source Linux LDAP server. Hardened by real-world use, full-featured, supports multi-master replication. 389 DS can be downloaded for free and set up in less than an hour using the graphical console' and is an app. There are eight alternatives to 389 Directory Server for Linux, Windows, Self-Hosted, Mac and BSD. The best 389 Directory Server alternative is Microsoft Active Directory. It's not free, so if you're looking for a free alternative, you could try FreeIPA or OpenLDAP. Other great apps like 389 Directory Server are SambaBox, GLAuth, ApacheDS and OpenDJ.
Active Directory (AD) is a directory service that Microsoft developed for Windows domain networks and included in most Windows Server operating systems as a set of processes and services.

FreeIPA is an integrated security information management solution combining Linux (Fedora), 389 Directory Server, MIT Kerberos, NTP, DNS, Dogtag (Certificate System). It consists of a web interface and command-line administration tools.



OpenLDAP Software is an open source implementation of the Lightweight Directory Access Protocol.

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...

ApacheDS™ is an extensible and embeddable directory server entirely written in Java, which has been certified LDAPv3 compatible by the Open Group. Besides LDAP it supports Kerberos 5 and the Change Password Protocol.
OpenDJ is a directory server which implements a wide range of Lightweight Directory Access Protocol and related standards, including full compliance with LDAPv3 but also support for Directory Service Markup Language (DSMLv2).

It's an active directory replacement built on CentOS + Samaba4. Includes support for Directory, DNS, DCHP, and NTP type services.




Full-fledged human- and machine-identity management suite with a convenient management interface