From Cjwdev: If you have ever assigned a user as a manager of a security or distribution group in Active Directory, you may have noticed the option "Manager can update membership list" which grants the user permission to add and remove members from this group. The only problem with this is that there is no easy way for the user to actually make these changes, other than through Microsoft Outlook. So Group Manager was designed to be an easy to use tool for end users to add and remove users, contacts, or groups to any groups that they are managers of, for any organizations that do not have (or do not want to use) Microsoft Outlook for this task. It will also be useful for any organizations that are using Outlook but are moving to a hosted Exchange solution, as end users will not be able to make changes to the local domain through Outlook in this scenario.
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