Calibre

You don’t need a dedicated device to enjoy ebooks. There are some excellent free apps around for reading them on your desktop too, and Calibre is one of the best. 
Calibre is a free, open source ebook reader that’s available for Windows, Mac and Linux, with an extra portable version for Windows PCs. This is particularly handy, because you can keep on a USB stick or other removable storage device along with your book collection, enabling you to read them on any PC.Calibre also su