Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
NeeView - Display two images simultaneously
Xodo - Try easy-to-use PDF tools that keep your documents safe. Work with your important files across all platforms and devices with the ultimate all-in-one document solution. Your productivity lives at Xodo!
ComicFlow - ComicFlow is an iOS app that allows you to read comics by opening .cbr or .
Evince - Evince is a document viewer for multiple document formats: PDF, Postscript, djvu, tiff, dvi, XPS...
ACBF Viewer - Comic book reader.