A Java-based LDAP API
Web-based LDAP address book browser/editor
JNDI DirContext source builder utility
Mature LDAP, LDIF and DSML client with i18n support.
A simple PHP library for LDAP authentication
The Identity Manager provides a solution to manage the user life cycle
LDAP client providing user friendly access to global address books.
A LDAP User Management System
A class for PHP to talk to Active Directory through LDAP.
Deprecated project - see http://wordpress.org/extend/plugins/wpmuldap/