Fragment - A powerful image viewing suite with advanced metadata info
ImageGlass - You can use Image to view your digital images and photos of many different formats.
Universal Viewer - Universal Viewer is an advanced file viewer for wide range of formats. Supported file formats are:
Phiewer - Image Viewer - Phiewer is the easiest and fastest way to view your images, videos and even audio files.
IrfanView - IrfanView ... one of the most popular viewers worldwide.
Geeqie Image Viewer - Geeqie is a lightweight Gtk+ based image viewer for Unix like operating systems.