One of the best Joomla forums extensions, simple to use and feature rich:
Organize your forums topics in categories and sub forums.
Full permissions control
Control who can read, post and manage your forums topics and posts, you can assign permissions per forum and have forum specific moderators.
Trophies and voting
Enable post voting and user trophies to motivate your users to join discussions.
Powerful private messaging feature, each user can have their own messages inbox and outbox.
Users can mark some of the post content as private, the content will be visible for them and for moderators only.
Allow users to upload and attach files easily using the bbcode editor.
Users can upload their avatars, they can also resize or crop the image to match the forum requirements.
Display advertising content inside the forums topics to promote content or generate revenue.
Favorites & Subscriptions
Users can add topics to a personal favorites list or subscribe to topics to receive topic updates.
Admins and users can tag and/or feature specific topics.
Clean and responsive layout.
Code highlighting feature in posts.
Full forum search feature based on word recurrence.
RSS feed feature for forums pages.
Most features use AJAX in order to perform tasks with minimum server load and without reloading pages.
Topics, posts and users can be quickly removed in case of spam.
Google noCaptcha support to block users posting spam content.
Rich text editor
Edit posts content easily using the built in rich text editor
Let your users use Emojis in posts.