mod_psldap is an Apache module for leveraging LDAP services built on the OpenLDAP library and the Apache APIs, to include web based A&A, web based updates to the LDAP store, server-side XSLT processing, and session management across servers.
ISPMan is a system to design massive ISPs using LDAP as the backend.
ISPMan provides a web front end and a command line interface to create virtual domains and manages users, dns information, email infos and httpd setup data for these vhosts.
An advanced web-based LDAP manager that has object-specific editors. In addition, one can easily extend or create new editors. It has a plugin engine which allows you to integrate your most common user/access management tasks into muclm's interface.
LDAP Administration console is a web-interface that provides a secure, attractive, and user-friendly userinterface to maintain and administer OpenLDAP in addition to user accounts, groups, etc in an OpenLDAP directory.
LIMeTool (pronounced like the fruit), is intended to be a simple and easy interface for managing accounts on an integrated Sendmail/LDAP/Cyrus IMAP installation. It's written in PHP and is realitively easy to configure and expand.