Katrina is a project mainly written in JavaScript, based on the MIT license.
Zoomable interface to post Hurricane Katrina aerial photo of New Orleans
An aerial photo of New Orleans, post Katrina, with a zoomable interface (back when this sort of thing was new).
http://entish.org/katrina/
To install, just copy to some directory. The tiles directory contains all the pieces.
I was working on clickable interfaces for a NASA autonomous helicopter at the time, and the code and images naturally fell together.