Pan0 is a very good looking panorama viewer

It is free, fast, and makes the panoramas look impressive. It uses a Flash-based spherical panorama viewer, which you can even embed into your own site or blog. Unlike Gigapan, Panoramio and similar sites, pan0.net takes care of perspective transforms, and allows to view the panorama as if you were rotating your head - it is not just zooming and panning a large flat image. It is much more immersive.

It Features

• very immersive spherical panorama player (open source)


• support for 360°×180° and partial panoramas (if angle of view is set)


• interactive map reference (also the view direction on the map)


• hotspots on the panorama (text or image)


• virtual tours


• panoramas are embeddable (just like you embed youtube videos)


• small and large resolution views, view on black or view on white

Upload limits

• Source panorama image can go up to 8000×4000, but it is effectively ‘rescaled to 5000×2500 for smooth panorama preview’;

Credit to @sastanin, from whom I sourced this info off StackExchange's Photography Site:
https://photo.stackexchange.com/questions/12765/online-viewer-for-panorama-photos