Ebook readers - Calibre still Free and going strong

Hi folks
Calibre the free e-book reader / organiser still going great -- it's also brilliant at converting epub to Amazon kindle format(s) so you don't have to rely only on Amazon for your e-books.

I'm amazed this software is still 100% FREE -- really good.

Cheers
jimbo

I still just use Sumatra, on the PC, for e-books..., that's if I even read an e-book on the PC, I'd rather curl up on the couch with a tablet.

@jimbo45
How do you add thumbnails to .epub files in Calibre?
Does Calibre need to be the default viewer?