BuddyPress.org

There is no such publically available plugin.

The one used on this site was custom-coded by Andy Peatling. He might release this as a plugin in the future, but in the near short-term, don’t expect anything to be available.

If you’re a coder, the basic premises are:

1) Create a new nav item for groups called “ratings”.
2) Utilize the activity stream so users can rate the group.
3) Save the rating as group meta when a review is made.

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Re: GD Star Rating – Milan Petrovic, the author of the plugin, has stated on a few occasions for some form of support for BP. When and what type of integration is still up in the air though.