I use Calibre all the time to put ebooks onto my Kindle. Ok so the interface looks like it was made in the 90s. But I don't know where I'd be without Calibre.

I use Calibre all the time to put ebooks onto my Kindle. Ok so the interface looks like it was made in the 90s. But I don't know where I'd be without Calibre. I have no idea what the other 100s of buttons do in Calibre.