The iF.SVNAdmin application is a web based GUI to your Subversion authorization file. It is based on PHP 5.3 and requires a web server (Apache) to be installed. (+ LDAP integration; no database required)
This is a php/ajax application that lists groups on a Leopard Mac OS X Server Open Directory. The user can then choose a group to manage and add or remove members to the group.
Directory Manager is a tool for managing LDAP directory data. It includes a schema independant editor, a schema viewer and some pretty Views of the data. (And an easy way to create your own custom views). Directory Manager requires an LDAP v3 server.