"Jomic is a viewer for comic books stored in CBZ, CBR, and PDF files. Features include a two page mode, caching and support for several image formats (PNG, JFIF/JPEG, TIFF, and GIF). It is Open Source software distributed under the GNU General Public License."
ZIP (CBZ), RAR (CBR), PDF
JPEG, GIF, PNG, TIFF, BMP & others
Java 1.4+, Java Advanced Imaging and unrar (3.50+)