XenForo - Intuitive. Social. Engaging. Fast. XenForo brings a fresh outlook to forum software.
Vanilla Forums - Build an engaging community forum using Vanilla's modern cloud forum software.
Discourse - Discourse is an open source discussion platform built for the next decade of the Internet.
NamelessMC - NamelessMC is a free to use and open source website software, built specifically for Minecraft servers who are looking for an all in one, easy to use community hub.
PunBB - PunBB is a fast and lightweight PHP-powered discussion board.
WoltLab Suite - PHP-based CMS built for forums and community building.