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.
Tachiyomi - A free and open source manga reader for Android.
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.
Mcomix - MComix is an user-friendly, customizable image viewer.