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