Proboards - ProBoards is a host of free forums with customer service.
ForumFree - ForumFree allows you to create a forum or a blog in a few simple steps.
Discourse - Discourse is an open source discussion platform built for the next decade of the Internet.
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.
phpBB - Raspberry Pi. The Raspberry Pi is a cheap, credit-card sized computer. The official website uses phpBB for their discussion forums. phpBB is not affiliated with nor responsible for any of the sites listed on the showcase.