Comix
Open Source
Comix is an image viewer specifically designed to handle comic books. It reads ZIP, RAR and tar archive.
GonVisor
Free
GonVisor is a multiple-format viewer for PC which supports pictures, comics, magazines, and books in electronic format.
YACReader
Open Source
YACReader is a comic reader and comic manager with support for cbr cbz zip rar comic files.
Compare ComicRack with alternatives
Compare YACReader and ComicRack and decide which is most suitable for you.