is an  implementation of the Lightweight Directory Access Protocol.

The suite includes:

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

Also available from the :

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

 

http://www.openldap.org/