Avoid Duplicate Titles is a plugin for WordPress by BuddyUser.com. Whilst it’s not specifically a BuddyPress plugin it is very useful for multi-user situations where there is a high chance of users creating posts with duplicate titles.
BuddyPress Registration Groups is a plugin that adds a list of groups to the registration form so that new members can be introduced and join your groups. It means they don’t need to go looking for them to be instantly tied in to their preferred groups. Adding this kind or form to your registration can help you to build a profile for each new member.
Buddy Notification bell is a BuddyPress plugin that adds a notification marker onto a page based on a shortcode, whenever the user gets a notification and is viewing a page with the shortcode loaded then the notification bell will sound and they will be able to click on the bell in order to view the notification.