CALIBRE is the giant of e-book management, and this app is the perfect (ahem) companion for it. With just a few clicks, I can add any book from my computer to my e-Reader over USB or Wi-Fi. I can also store my e-books on the cloud for easy access from wherever I am . What’s so surprising is how well it works, and how easy it is to use. If I have got a lot of e-books and are ready to cast off the shackles of Amazon, this is the app for me.