XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
Fragment - A powerful image viewing suite with advanced metadata info
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.
Viewnior - Very simple and fast image viewer. No support for IPTC metadata such as image tags/keywords.
nomacs - nomacs is a free, open source image viewer, which supports mu