What we got?
By the way, if we don't got what you want, we can probably make it. Request a feature »
It's Drupal so you've got lots of options and ways to build what you need. Chances are if there's something you want to do, someone's done the legwork.
Standard Forum stuff
Create threads, replies, listings of the aforementioned along with a comprehensive permissions list. A perfect storm of really basic things done well.
Kitchen sink integration
Again back to the Drupal, Harmony is integrated up the wazoo with the community favourite modules. We've got guides and details on how to tweak Harmony.
@ mention other users
Pretty neat, you can @ mention users in the middle of posts, notify the user being mentioned and know whether or not a mention is removed or part of an edit.
Comprehensive access layer
Huh? A clone of Drupal's node access layer this means you can do very complicated things around who should be able to see, edit and create things in various places.
Highly customisable search
If you want to build a search system based off of whatever highly creative criteria you have you can. It also integrates with the access layer.
Admins & Moderators can enjoy content listings and users can report spammy looking content (and state any reasons). Everyone's happy!
Harmony has integration with both Akismet and Mollom anti-spam text analysis services. If the service isn't sure you can put that content to a moderator to decide.
If you want to prevent or obscure any effing and jeffing in your community then you can.