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SocialEngine - Socialengine PHP: Elevating Your Online Community Experience.
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JomSocial - Open Source Social Networking Software. Award winning open source community software by JomSocial. This social networking software is widely used by many Joomla users.
BuddyPress - WordPress social networking in a box.
EasySocial - Social Network For Joomla to grow your communities with the least time.