Last Post Date Column in the Users List
Shows when each user last published a post, which makes inactive authors easy to find.
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.
Make Authors Submit Posts for Review
Takes away the authors' right to publish, so their posts go to Pending Review for an editor to approve.
bbPress: "Mark as Solved" for Support Topics
Lets topic authors and moderators mark a topic as solved with one click; solved topics get a "[Solved]" label in their title so others find answers quickly.
bbPress: Post Count and Join Date Under Forum Authors
Shows how many posts each member has made and when they joined under their name in forum topics and replies.