Sumatra PDF

Open source, fast, PDF and eBook viewer
Homepage:	https://www.sumatrapdfreader.org/free-pdf-reader
Source Code:	https://github.com/sumatrapdfreader/sumatrapdf
Cost:	Open source
Platforms:	Windows
Language:	C++
Input Formats:	EPUB, PDF, PDF/A, MOBI, XPS
Function:	Rendering
Content type:	Document,EBook