calibre - Ebook manager, viewer & converter
NeeView - Display two images simultaneously
Icecream Ebook Reader - Ebook Reader by Icecream Apps allows to read ebooks in several formats (EPUB, MOBI, FB2 and others). Download EPUB Reader for Windows.
ComicFlow - ComicFlow is an iOS app that allows you to read comics by opening .cbr or .
Adobe Digital Editions - ebook reader software
ACBF Viewer - Comic book reader.