calibre - Ebook manager, viewer & converter
Mcomix - MComix is an user-friendly, customizable image viewer.
FBReader - FBReader is an e-book reader for various platforms. Features:
YACReader - Download YACReader for your platform. Windows, Linux, MacOSX. And enjoy you comic books cbr cbz with the best comic reader.
NeeView - Display two images simultaneously
Panels - Comic Reader - Panels is a CBR/CBZ/PDF comic reader for your iPhone and iPad devices. Enjoy reading your comics in a clean and delightful interface.