Fragment - A powerful image viewing suite with advanced metadata info
Photoscape - high quality photo editing software, that enables you to fix and enhance photos.
IrfanView - IrfanView ... one of the most popular viewers worldwide.
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
ImageGlass - You can use Image to view your digital images and photos of many different formats.
GIMP - GIMP is a multiplatform photo manipulation tool.