Hyperactive Directory Administrator (HAD Administrator) is a graphical tool for administering Users, Groups, Hosts and other objects in an LDAP directory. It differs from other tools available such as GQ in that it is not designed to be a general purpose directory editor and is only intended for use in an LDAP environment (it doesn't do anything with NIS or local files). HAD Administrator is roughly modelled after the Microsoft Active Directory Users and Computers tool, which I find surprisingly useful.