Calibre is an 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. Calibre manages your e-book collection for you. It is designed around the concept of the logical book, i.e., a single entry in your library that may correspond to actual e-book files in several formats.

Calibre is an 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. Calibre manages your e-book collection for you. It is designed around the concept of the logical book, i.e., a single entry in your library that may correspond to actual e-book files in several formats.