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.
The final flight of the Space Shuttle Discovery. STS-133 (Space Transportation System - mission 133) clears the launch tower of Launch Pad 39A from the Kennedy Space Center in Cape Canaveral, Florida. The late afternoon sun backlights the expanding exhaust plumes from the two solid rocket propellant engines. This mission marked both the 133rd flight of the Space Shuttle program and the 39th and final flight of Discovery.
Equipment: Canon EOS 5D Mark II with Nikkor 8mm/2.8 fisheye for the upper hemisphere and Canon EOS 5D with Tokina 12mm fisheye lens for the lower hemisphere, Nodal Ninja NN5 pano heads, PTGui Pro 9.0