Calibre is one of the great tools to manage e-books, most specifically, it can be used to convert your Kindle Book to PDF. It is completely free and open-source software. You can convert your kindle book to various other formats [watch the tutorial video on YouTube]. You can download Calibre for Windows, Mac, Linus, etc.

Calibre 4.x or Calibre 5.x – know which DRM plugin you should be using:

• Know which DeDRM plugin you should be using : Click here