Komikku - An online/offline manga reader for GNOME developed with the aim of being used on the Librem 5 phone.
NeeView - Display two images simultaneously
Mcomix - MComix is an user-friendly, customizable image viewer.
ComicFlow - ComicFlow is an iOS app that allows you to read comics by opening .cbr or .
YACReader - Download YACReader for your platform. Windows, Linux, MacOSX. And enjoy you comic books cbr cbz with the best comic reader.
ACBF Viewer - Comic book reader.