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

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.

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

FusionDirectory is a modern, efficient and secure identity management solution (IAM). FusionDirectory is the only complete solution for all your identity and infrastructure management need with specific support for French higher education research.




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.
Oracle Unified Directory is an all-in-one directory solution with storage, proxy, synchronization and virtualization capabilities.