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Simple Machines
Forum by Simple Machines LCC.
Simple Machines Forum — SMF in short — is a free, professional grade software package that allows you to set up your own online community within minutes. Its powerful custom made template engine puts you in full control of the lay-out of your message board and with our unique SSI – or Server Side Includes – function you can let your forum and your website interact with each other.
SMF is written in the popular language PHP and uses a MySQL database. It is designed to provide you with all the features you need from a bulletin board while having an absolute minimal impact on the resources of the server. SMF is the next generation of forum software – and best of all it is and will always remain completely free!
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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, phpBB™ will grow with, and complement your website. With millions of installations worldwide, it is no wonder phpBB™ 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.