OpenLDAP Software is the premier open source implementation of the Lightweight Directory Access Protocol. It is the most reliable and standards-compliant. Since 2005 it has been the world's fastest; it is the gold standard against which all other directory software is compared.

The suite includes:

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