ForumWP

ForumWP is a WordPress plugin that turns your WordPress site into a fully functional forum. With this plugin, you can allow registered users to create topics, write replies, subscribe to topics, and much more. It also provides users with an interface to edit permissions for other users, set global user groups, write blogs within the context of forums, moderate posts, etc. It also includes anti-spam features like IP-based bans, captcha images, and more. And you can use shortcodes for forum-specific information/layout as well!

Benefits of ForumWP:

• Fast and easy to use
• Private messages between users
• Customizable email notifications
• Ability to moderate forum activity using moderators
• Topic watch feature so you can track replies
• Easy to install and use
• Unlimited forums