LDAP client Application Programming Interfaces (APIs)

Java Naming and Directory Interface (JNDI) a unified interface for naming and directory services

Bridge LDAP/JDBC

LDAP Class Libraries for Java (JLDAP) a classic style SDK

Mozilla/Netscape Directory SDK for Java a classic style SDK

Spring LDAP a Java library for simplifying LDAP operations

Perl-LDAP (Net::LDAP) is a collection of pure Perl modules which provide an object orientated LDAP API.

PerLDAP is an interface to the C SDK API, and a set of Object Oriented Perl classes.

PHP has a built-in support for LDAP.

adLDAP is a open source PHP class that provides LDAP authentication with Active Directory.

PEAR Net_LDAP is a clone of Perls Net::LDAP object interface to directory servers.

Python-LDAP is an LDAP API for the Python language.

Ldaptor is a set of pure-Python LDAP client programs, applications and a programming library

Ruby/LDAP is an extension module for Ruby. It provides the interface to some LDAP libraries (for example, OpenLDAP, UMich LDAP, Netscape SDK, ActiveDirectory). The common API for application development is described in RFC1823 and most libraries comply with it. Ruby/LDAP supports those libraries.

siLeDAP contains a set of REST web services for make operations with LDAP easier. presentation at TNC 2007

google-apps-for-your-domain-ldap-sync Package for synchronizing Google Apps for Your Domain with an LDAP server

Cisco Cisco IP Phone Services Software Development Kit (SDK) a COM server object that performs LDAP queries and returns entries in the Cisco IP Phones Services XML data format

Eudora Ph2LDAP Adapter for Unix converts Ph queries to LDAP search requests then returns the results to the Ph client. Freeware.