Originally intended as a gateway protocol to X.500 directory servers, it is often the primary interface to directory servers (e.g., OpenLDAP's slapd, Novell Directory Server, iPlanet Directory Server, Microsoft Active Directory).
There are several LDAP libraries for Common Lisp:
- trivial-ldap - TRIVIAL-LDAP is a one-file, pure-Lisp client library for parts of RFC 4510 - Lightweight Directory Access Protocol (v3), LDAP