NeeView - Display two images simultaneously
Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
Soda PDF 3D Reader - Read any PDF document like a book using our patent pending 3D technology!
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
ComicFlow - ComicFlow is an iOS app that allows you to read comics by opening .cbr or .
HoneyView - HoneyView is a fast image viewer that supports archived image file for comics/manga/photos.