ImageGlass - You can use Image to view your digital images and photos of many different formats.
Retrobatch - Retrobatch is a unique application for automating actions to tens, hundreds, and even thousands of images at the same time
IrfanView - IrfanView ... one of the most popular viewers worldwide.
FastPictureViewer - A hardware-accelerated image viewer for the modern Windows platform.
FreeVimager - Free & Fast Image Viewer and Editor for Windows.
AYVY - JPEG/PNG/RAW Images viewer