Proboards - ProBoards is a host of free forums with customer service.
Disciple - Grow, engage and monetise your community with Disciple community software. Get your own branded community platform on Web, iOS and Android
PlushForums - PlushForums is a modern online forum hosting platform.
ZetaBoards - ZetaBoards offers free forum hosting that serves a site for growing an online community.
XenForo - Intuitive. Social. Engaging. Fast. XenForo brings a fresh outlook to forum software.
Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.