Simple Machines Forum - Simple Machines offers free open source software such as SMF, the powerful and easy to use community forum written in PHP. Start interesting discussions on your website!
Vanilla Forums - Build an engaging community forum using Vanilla's modern cloud forum software.
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.
Discourse - Discourse is an open source discussion platform built for the next decade of the Internet.
XenForo - Intuitive. Social. Engaging. Fast. XenForo brings a fresh outlook to forum software.
NodeBB - NodeBB Forum Software - A better community platform for the modern web. NodeBB is a next generation forum software that's free and easy to use.