ForumEngine is a responsive and retina-ready forum theme for WordPress. The theme comes with a simple, but modern design. It is mainly designed for discussion and user interaction. Most administrative tasks can be handled from the frontend; ther backend only needs to be visited if you want to change some core settings. Publishing and editing content can be done via the frontend so your users don’t need to log in to the WordPress backend.
Here are some of the most important features of ForumEngine: infinite scroll, use ForumEngine on existing blogs, Login by Facebook and Twitter accounts, theme customization features, Follow your favorite topics, personal profile page for users, different colors for categories, Gravatar support, Quoting from other replies in your reply, Optimized text spacing for easier reading, Unread topics are easy to spot, WPML support ….