dpolant

BP Group Control is a set of tools that gives group admins the ability to create new members for their groups, add existing users to their groups, directly delete members, and assign their members an identifying tag ( the group name ) that shows up next to their display name on their profile and directories. These features are supported by a rich options page that allows site admins to tweak the permission settings for these abilities.
Be careful with this plugin! Make sure you trust your group admins with the power you grant them.
You can choose to have different parts of this plugin active for public vs private groups as well.

Bp Group Control

BP Group Control is a set of tools that gives group admins the ability to create new members for their groups, add existing users to their groups, dir …

Dwenaus

This plugin allows you to assign tags to BuddyPress groups in order to categorize them. You can then show a clickable tag cloud above the group 
listings or as a widget. BuddyPress 1.9 friendly.
New to version 2.0. You can show group activity stream based on tag. For example, if you have ten groups tagged ‘sports’ you can show a combined activity feed for just those groups. It’s powerful stuff for larger sites with lots of conversations. using the gtags_group_activity() function you can even find the activity of groups that share two tags, or you can show activity for two tags added together.
Group Tag activity shortcode example: [group_tag_activity tag=Love show=10]
There is a group tag activity widget
There is an admin where you can turn off and on different aspects of the group tags as well as customize the tag cloud.
Translations: 
Swedish: Malin Jonsson – Oddalice.se 
please email translations to deryk@bluemandala.com so I can include them in the next update.

BuddyPress Group Tags

Categorize BuddyPress groups using tags. Show a clickable tag cloud above the group listings or as a widget.

Bp Group Control vs BuddyPress Group Tags