Makevt is a free cloud version of the krpano engine. There is a fee version which supports HTML5 for better viewing on tablets and smartphones.

Makevt empowers users to add text to objects, create hotspots that react to mouse hovers, insert images, animations, and video, create transitions between separate scenes, add custom or Google maps, insert a compass, add weather effects, and set up an automatic camera rotation. Set up an account at http://www.makevt.com