IrfanView - IrfanView ... one of the most popular viewers worldwide.
ImageGlass - You can use Image to view your digital images and photos of many different formats.
Phiewer - Image Viewer - Phiewer is the easiest and fastest way to view your images, videos and even audio files.
FreeVimager - Free & Fast Image Viewer and Editor for Windows.
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.
Gwenview - Gwenview is an image viewer for KDE.