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.
ImageGlass - You can use Image to view your digital images and photos of many different formats.
CDisplay Ex - CDisplay Ex is the most used comic book reader.
HoneyView - HoneyView is a fast image viewer that supports archived image file for comics/manga/photos.
IrfanView - IrfanView ... one of the most popular viewers worldwide.
Simple BPG Image viewer - This program allows you to view BPG Images.