calibre-ebook

Calibre is a free and open source e-book library management application developed by users of e-books for users of e-books. It has a cornucopia of features divided into the following main categories: Library Management, E-book conversion, Syncing to e-book reader devices, Downloading news from the web and converting it into e-book form, Comprehensive e-book viewer, Content server for online access to your book collection, and E-book editor for the major e-book formats.