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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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VidiScript
Packed with features you can only find on major media sharing communities such as YouTube and LiveVideo, VidiScript is the most powerful FREE media sharing community script available online today.
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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.