OpenLDAP

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

The suite includes:

• slapd - stand-alone LDAP daemon (server)
• libraries implementing the LDAP protocol, and
• utilities, tools, and sample clients.

Also available from the OpenLDAP Project:

• Fortress - Role-based identity access management Java SDK
• JLDAP - LDAP Class Libraries for Java
• JDBC-LDAP - Java JDBC - LDAP Bridge Driver

http://www.openldap.org/