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swap-bot - Swap-bot is a online service that organizes group swaps and a community of creative individuals.
calibre - Ebook manager, viewer & converter
Postcrossing - A postcard exchange project that invites everyone to send and receive postcards from random places in the world. For free!
FBReader - FBReader is an e-book reader for various platforms. Features:
InterPals - InterPals is a friendly community of over 5 million friends, language learners, travelers and penpals.
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.