galapix - A Zoomable Image Viewer
galapix is an image viewer that allows you to directly zoom into large collection of tens of thousand of images from tiny thumbnails down to the images original size fluently with very short load times and no loss of interactivity. It accomplishes this by keeping a tile cache which stores not only thumbnails for one size, but thumbnails of many different sizes. This thumbnail cache requires at maximum 1.5x times as much storage as the images themselves, but as tiles are generated on demand often far less.
galapix can also be used to view gigapixel sized images. The Zoomify ImageProperties.xml file format is support.
galapix supports a wide varity of image formats including JPEG, PNG, XCF (Gimp), KRA (Krita) and all stuff supported by ImageMagick.
Actually this is fork from Google code project with small fixes.