No BookCrossing Core videos yet. You could help us improve this page by suggesting one.
BuddyPress - WordPress social networking in a box.
swap-bot - Swap-bot is a online service that organizes group swaps and a community of creative individuals.
Elgg - Opensource social network engine
Postcrossing - A postcard exchange project that invites everyone to send and receive postcards from random places in the world. For free!
SocialEngine - Socialengine PHP: Elevating Your Online Community Experience.
InterPals - InterPals is a friendly community of over 5 million friends, language learners, travelers and penpals.