Tuiojs-kasuari is a project mainly written in JAVASCRIPT and PYTHON, based on the MIT license.
Multitouch-enabled Multiscale Image Viewer
Kasuari is a web-based multi-scale image viewer. With Kasuari, you can view a very large image on a web browser. You can zoom in and out to see more or less detailed view of the image.
If you are familiar with Google Maps, then you should also familiar with Kasuari. In fact, both are using the same technique to view a very large image, such as a world map.