Xee - Xee lets you easily browse and manage images on your Mac. Browse images within folders and archives, move and copy them right in the app.
Phiewer - Image Viewer - Phiewer is the easiest and fastest way to view your images, videos and even audio files.
CDisplay Ex - CDisplay Ex is the most used comic book reader.
ImageGlass - You can use Image to view your digital images and photos of many different formats.
IrfanView - IrfanView ... one of the most popular viewers worldwide.
Fragment - A powerful image viewing suite with advanced metadata info