By interactive, I mean the software should provide capability to pan/zoom parts of the images just like how Google Maps are displayed.

I have some very large images (with resolution more than 10000x15000).

Typical image viewers load images entirely in memory, but for very large images zooming/viewing of specific portions is required.

Vliv is one such software but it only support TIFF format.

Update: Although not exactly a desktop software, Panojs is a perfect fit for above purpose. One need to create a HTML web app (which can used locally as well as deployed on a webserver).