If you own an ebook reader, or just feel like reading ebooks on your desktop or netbook, Calibre will help keep them organized. Calibre is a library for eBooks that has a big, bold interface that's really easy to use. Ebook files of most formats can just be dragged into the Calibre window.
Editing the metadata, such as title and genre, is simple with the click of a button on the toolbar. You can also select multiple books and edit them in bulk, making it convenient for regrouping books in a particular genre.
Viewing ebooks is just a button click away, opening an ebook reader window. Here, you can adjust the font size, add bookmarks, and more. Calibre also offers the option to download feeds from news websites, although the layout results can sometimes be a bit odd. Additionally, Calibre provides ebook reader synchronization, ensuring that your device stays up to date.
Free, open-source, and easy to use, Calibre is a great e-book library tool and reader.