Features include metadata editing and downloading, coverpage downloading., book tagging and categorization, webpage-to-ebook converter for popular websites, etc. Lots of plugins available to extend functionality.
Calibre has an optional portable build that can be stored on external media along with the users library. I t can then be opened from the external media on any windows device.
The application consists of a single file that can be run without installation. You can put it on an external device, such as an usb thumb stick and run it on any Windows machine from the thumb stick.
The Kobo app will sync the users whole library as well as each position read for each title. This way a user can pick up where they left off from one device to the next.
The Kobo app supports just about every main OS out there. iOS, Android, Windows 8, Windows 8 Phone and Blackberry 10. By being available on so many platforms the user is able to read their eBooks on any device they wish.
The Kindle app for Android features an in built eBook store within the app that sells eBooks, magazines, newspapers, comic books and graphic novels. Amazon also offers one of it not the biggest eBook store available today.
Kindle for PC is one of the many apps available from Amazon for the Kindle platform. This allows users to keep their library with them no matter what device they are using.
The eBooks available from Amazon do not offer normal page numbers, printing or even copy paste, which makes using any of the ebooks for reports or papers pretty much impossible.
Users can purchase their .epubs from a number of stores that allow for a separate download of an .acsm file that can be uploaded to Adobe Digital editions.
All books are automatically divided in categories such as "not read", "borrowed", "purchased", "recently read", and "recently added" and additional categories can be added manually. They can be sorted by various criteria including "title", "author", "publisher", "date of addition", and "number of pages". Great for managing large quantities of books.
PRO version of the reader is required for reading without gigantic "Buy Me" billboard shoved in face every minute for 10 seconds. Oh and it's needed to copy and paste and edit.
The application has an easy to use and understand interface with important features such as search always within easy reach at the top.
The interface can also be customized to best suit wishes. For example, font size can be changed, there's choice between single and double column view when reading books, or table and bookshelf view when managing the library.
The app tracks how much of the book has been read, jumping between chapters or bookmarks can be done with a few clicks, and there's even a distraction-free mode that takes away all the interface and allows focusing on the book.