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swap-bot - Swap-bot is a online service that organizes group swaps and a community of creative individuals.
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.
Postcrossing - A postcard exchange project that invites everyone to send and receive postcards from random places in the world. For free!
Amazon Kindle - Amazon Kindle software lets you read ebooks on your Kindle, iPhone, iPad, PC, Mac, BlackBerry, and...
InterPals - InterPals is a friendly community of over 5 million friends, language learners, travelers and penpals.
LibriVox - free public domain audiobooks