Calibre is a complete e-library solution. It includes library management, format conversion, news feeds to e-book conversion, e-book viewer and editor, and e-book reader sync features.
Calibre is primarily an e-book cataloging program. It manages your e-book collection for you. It is designed around the concept of the logical book, i.e. a single entry in the database that may correspond to e-books in several formats. It also supports conversion to and from a dozen different e-book formats.
Calibre supports almost every single e-Reader (e.g., Kindle, Kobo, Nook) and is compatible with more devices with every update. Calibre can transfer your e-books from one device to another in seconds, wirelessly or with a cable. It will send the best file format for your device converting it if needed, automatically.
Calibre can automatically fetch news from a number of websites/RSS feeds, format the news into a e-book and upload to a connected device.
Calibre has also a built-in e-book viewer that can display all the major e-book formats.