IrfanView - IrfanView ... one of the most popular viewers worldwide.
Retrobatch - Retrobatch is a unique application for automating actions to tens, hundreds, and even thousands of images at the same time
Fragment - A powerful image viewing suite with advanced metadata info
AYVY - JPEG/PNG/RAW Images viewer
ImageGlass - You can use Image to view your digital images and photos of many different formats.
NX Studio - Nikon | Imaging Products | Software