openldap: openldap (Lightweight Directory Access Protocol) openldap: openldap: OpenLDAP is an open source implementation of the Lightweight Directory openldap: Access Protocol. LDAP is a alternative to the X.500 Directory Access openldap: Protocol (DAP). It uses the TCP/IP stack versus the overly complex OSI openldap: stack. openldap: openldap: LDAP is often used to provide authentication (such as for email). openldap: openldap: Homepage: https://www.openldap.org/ openldap: