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phpBB
By phpBB Group.
Since its creation in 2000, phpBB™ has become the most widely used Open Source forum solution. Like its predecessors, phpBB™ 3.0 “Olympus†has an easy to use administration panel and a user friendly installation process, which allows you to have a forum set up in minutes.
With a large and highly customisable set of key features coupled with a standards compliant interface, phpBBâ„¢ will grow with, and complement your website. With millions of installations worldwide, it is no wonder phpBBâ„¢ is one of the most popular ways to create and support a community.
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Elgg
By Curverider. Their tagline is :
Elgg: a powerful, professional social engine.
Elgg empowers individuals, groups and institutions to create their own fully-featured social environment.
Elgg is open source.
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Dolphin
By Boonex.
Dolphin is an open-source community builder. It is both free and paid depending if you want to keep their footer copyright name or not.