Screenshot 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.

Jomic.dmg Download Jomic for Mac OS X 10.3 or later.
Jomic Start Jomic using Java Web Start.
Jomic-Installer.jar Download Jomic-Installer for other platforms. You need Java 1.4 (or later) and the unrar command (version 3.50 or later).
Jomic.zip Download Jomic for other platforms as a single JAR file. You need Java 1.4 (or later), Java Advanced Imaging and the unrar command (version 3.50 or later).

If you want to contribute or just toy with the source code, read the Developer Guide for hints on how to get started.