most (not all, some contributions are QTVR-only due to historical reasons)
Javascript + HTML5 / WebGL
many, but depends on photographer's choice of file upload (newer event = more likely to work) and your device's capabilities. You may experience slow playback, distorted images or unexpected browser quitting if there is only limited memory/GPU power available.
It was a cold wet weekend, when it finally cleared up, the Marketplace was
sleeping.
A shot of the Covent Garden Market, Talbot and King Streets, London,
Ontario, Canada. Across the street is the John Labatt Centre.
Equipment: The completed image comprises of 12 shots taken with a Nikon D70 using the
stock lens at 18mm's, and a 2 second exposure. The images were then loaded
into the iLOOKabout One
step Pano Stitching Wizard. The resulting strip was then loaded into
Photoshop, made into a proper 360 strip (there was 100 pixels of overlap to
start). The image was padded to 2:1 ratio, and then converted to QuickTime
for WWP submission.