D Cartwright

Included component allows group admins to easily promote/demote/ban members from all their groups.
It can be further extended using the standard buddypress profile subnav registration functions (for example, the bp-wiki plugin hooks into this to enable movement of wiki pages between groups).

BuddyPress Frontend Admin

This plugin brings site-wide-like administration options to the frontend, allowing group admins simpler management of all of their groups.

shawfactor

This plugin redirects users who are only a meber of one buddypress group to the actual group page rather thab the listing of theiur groups when the user vists the buddypress User Groups page.
I wrote this plugin because on a site I built users would only ever be members of one group. As such it was pointless for them to be sent to the Buddypress user groups page, from where they would have to navigate to the the page they were a member of anyway.
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LH Buddypress Group Redirect

Redirect group members where they are members of only one group

BuddyPress Frontend Admin vs LH Buddypress Group Redirect