Sumatra PDF

Sumatra PDF works as a reader of multiple file formats. It can open PDF files. But that is not all. We can also fine eBooks, XPS, CHM, and DjVu on the app’s list of compatible formats.

The outer look is rather simplistic, but all you need is a space to read, even if one may consider the lack of annotating devices a downfall.

At your disposal are a bunch of keyboard shortcuts, some command line arguments for more advanced users, and a browser plug-in that may turn useful when an eBook needs previewing.