calibre - Ebook manager, viewer & converter
NeeView - Display two images simultaneously
Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
ComicFlow - ComicFlow is an iOS app that allows you to read comics by opening .cbr or .
Haihaisoft PDF Reader - Haihaisoft PDF Reader is the name of a free to use PDF reader and printer that is extremely simple to launch.
ACBF Viewer - Comic book reader.