Download key generator for Calibre 2.44.1

Calibre is designed to be an all-in-one open source tool for all of your e-books. It manages your e-book collection for you. It is designed around the concept of the logical book, i.e., a single entry in your library that may correspond to actual e-book files in several formats.
Features:
- 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