OpenComic - Open-source comic and manga reader for the desktop.
Comic Seer - Comic Seer is one of the simplest and fastest applications that is used for reading, viewing and managing the comic stuff.
ACBF Viewer - Comic book reader.
CDisplay Ex - CDisplay Ex is the most used comic book reader.
Kuboo - Free and open-source Ubooquity client for loading and reading comics on Android.
C.B.R. - Comic Book Reader - Comic Book Reader is the viewer you need to enjoy all your electronic publication.