The ZoomifyImage product allows you to use Zoomify (http://www.zoomify.com/) from the command line and within the Zope environment to quickly and interactively view large, high resolution images over the Web.
The download page states that the license is GNU GPL. This is wrong. A license file is included in the download, and it is not the GPL.
Just to show some love for zoomify.. zoom-and-pan works great for my high-res images