ImageGlass - You can use Image to view your digital images and photos of many different formats.
Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.
IrfanView - IrfanView ... one of the most popular viewers worldwide.
Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
FreeVimager - Free & Fast Image Viewer and Editor for Windows.
Wondershare PDFelement - All-in-one PDF editor