Sumatra PDF is a open Source eBook reader that can read MOBI (Kindle) EPUB (NOOK and iTunes) PDF and just about any eBook format out there. It will work right on your desktop – laptop and loads quickly. Whenever I am reading something at my desk or on my laptop it is what I am using.
Open Source stuff is meant to be free stuff that is striving to be equal to pay software, and Sumatra is there.
The Web site and a compiled Windows version: https://www.sumatrapdfreader.org/download-free-pdf-viewer.html
Get an EXE installer for WIN 32 or WIN 64
Like to work with code? You can go to GITHUB and download the source code and compile your own version: https://github.com/sumatrapdfreader/sumatrapdf
An image below of me reading Flint Of Dreams in Sumatra…
Flint Of Dreams:
An image of me Reading Invariant a graphic novel in Sumatra…
Check it out if you need a reader that can read all of your eBooks, PDF documents and more….