XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
YACReader - Download YACReader for your platform. Windows, Linux, MacOSX. And enjoy you comic books cbr cbz with the best comic reader.
IrfanView - IrfanView ... one of the most popular viewers worldwide.
Mcomix - MComix is an user-friendly, customizable image viewer.
JPEGView - JPEGView is a small and fast viewer/editor for JPEG, BMP, PNG, GIF and TIFF images.
CDisplay Ex - CDisplay Ex is the most used comic book reader.