MComix

Mcomix is a free downloadable image viewer designed with western comics and manga as its primary focus. Simply open the file or folder holding your comic and read it with little to no fuss. Digital comics are usually distributed as CBZ or CBR files, which are ZIP or RAR archives full of images, or as PDF documents, and MComix opens them without unpacking them first. MComix is a fork of the Comix viewer, whose development stopped in 2009, and focuses on bug fixes and stability. It reads these files directly, and gives you the option to read them double-paged, like an open printed book. 

It also has single page options, full screen, zoom features, and a slideshow mode. For those who like to read the traditional manga, there's an option to set the reader on a 'right-to-left' option. Quickly jump to specific pages and always know where you are at with the bookmark feature. 

Written using Python, this program works on both Linux and Windows and can read a large variety of formats.

Features:

• Reads PDF, 7Z, ZIP, RAR and LHA archives (CBZ, CBR, CB7, CBT) directly
• Has a manga-mode option, allowing for the right to left reading 
• Zoom features to focus on the details
• A chance to read double or single pages at a time
• It's free and open source under the GNU GPL

MComix also offers a library for your comic collection, smart scrolling, image rotation and enhancement tools. Pages can be fitted to the width or height of the window, and images can be rotated automatically according to their metadata. The background colour, thumbnail size and keyboard shortcuts can be changed in the preferences. The pre-built Windows packages already include all the libraries the program needs, while on Linux and BSD systems it runs with Python and GTK. Bug reports, downloads and documentation are available on the project's SourceForge page.