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swap-bot - Swap-bot is a online service that organizes group swaps and a community of creative individuals.
eXo Platform - Digital workplace solution
Postcrossing - A postcard exchange project that invites everyone to send and receive postcards from random places in the world. For free!
Basecamp - A simple and elegant project management system.
InterPals - InterPals is a friendly community of over 5 million friends, language learners, travelers and penpals.
BuddyPress - WordPress social networking in a box.