By Evgenia Vazenmiller & Timo about MultiViewer
MaxView is a tiny, fast and innovative image viewer that supports all major graphic formats.
IrfanView - very popular image viewer
XnView is freeware software that allows you to view and convert graphic files.
Drag and drop photo sharing. Dramatically simpler than email or web site sharing
FastPictureViewer, an image viewer designed for photographers.