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swap-bot - Swap-bot is a online service that organizes group swaps and a community of creative individuals.
SocialEngine - Socialengine PHP: Elevating Your Online Community Experience.
Postcrossing - A postcard exchange project that invites everyone to send and receive postcards from random places in the world. For free!
mooSocial - mooSocial is the best social network script to create a niche community or social site.
InterPals - InterPals is a friendly community of over 5 million friends, language learners, travelers and penpals.
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.