BuddyPress: Add New Members to Groups Automatically
Adds every newly activated member to the BuddyPress groups you choose, such as a "Welcome" or "Announcements" group.
Snippet Library
Users snippets for WordPress
Snippets for user accounts, roles and profiles: extra profile fields, new columns in the users list, last-login tracking and tighter control of what each role can do. Handy for membership sites, client sites and teams with many authors.
bbPress: Only Staff Can Start Topics in Announcement Forums
Stops regular members from creating new topics in chosen forums, such as Announcements, while still letting them reply.