Directory Service
A directory service (DS) is an application that stores and organizes information about a computer network's users and network resources, and that allows network administrators to manage users' access to the resources.
Fedora Directory Server
The enterprise-class Open Source LDAP server for Linux. It is hardened by real-world use, is full-featured, supports multi-master replication, and already handles many of the largest LDAP deployments in the world. The Fedora Directory Server can be downloaded for free and set up in less than an hour using the graphical console.
OpenLDAP
OpenLDAP Software is an open source implementation of the Lightweight Directory Access Protocol.
