Proboards - ProBoards is a host of free forums with customer service.
Discourse - Discourse is an open source discussion platform built for the next decade of the Internet.
ForumFree - ForumFree allows you to create a forum or a blog in a few simple steps.
XenForo - Intuitive. Social. Engaging. Fast. XenForo brings a fresh outlook to forum software.
ZetaBoards - ZetaBoards offers free forum hosting that serves a site for growing an online community.
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.