Ruuttu

This is a tiny plugin that simply re-enables breadcrumbs for BuddyPress group forums. Enable the plugin, enable the breadcrumbs. Simple.
Make sure you’re using the latest BuddyPress and bbPress.

Group Forum Crumbs

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.

Group Forum Crumbs vs BuddyPress Group Tags