wpForo Forum
Number one WordPress forum plugin. Full-fledged forum solution with modern and responsive forum design. Community…
Plugin Tag: forum plugin
Discussion Board – WordPress Forum Plugin
Discussion Board is an easy way to add a WordPress forum to your site.
ForumLines
Make a ForumLines forum work nicely with your WordPress blog.
Neoforum
Neoforum is full-fledged forum engine for WordPress, including all standard forum functionality.