ForumFree - ForumFree allows you to create a forum or a blog in a few simple steps.
Disciple - Grow, engage and monetise your community with Disciple community software. Get your own branded community platform on Web, iOS and Android
Proboards - ProBoards is a host of free forums with customer service.
DirectIQ - Send better emails, get better results
PlushForums - PlushForums is a modern online forum hosting platform.
ZetaBoards - ZetaBoards offers free forum hosting that serves a site for growing an online community.