Apache Directory Studio
The Eclipse based LDAP browser and directory client
Apache Directory Studio is a complete directory tooling platform intended to be used with any LDAP server however it is particularly designed for use with ApacheDS. It is an Eclipse RCP application, composed of several Eclipse (OSGi) plugins, that can be easily upgraded with additional ones. These plugins can even run within Eclipse itself.
Java
Lightweight Directory Access Protocol (LDAP): The Protocol
IETF
RFC 4511