Pano2vr is described as 'Pano2VR for Mac OS X, Windows and Linux is an application that converts panoramic images into the QuickTime VR (QTVR) or Macromedia Flash 8 and Flash 9 & 10 formats with features such as customizable skins, hotspots, directional sound and auto-rotation' and is an app in the Photos & Graphics category. There are five alternatives to Pano2vr for Windows, Mac and Linux. The best alternative is Bixorama. It's not free, so if you're looking for a free alternative, you could try Qbit or lux. Other great apps like Pano2vr are Flash Panoramas (Paid) and 3D Vista Virtual Tour (Paid).
Qbit is a tool for game developers. Given an image, the application will output six images using equirectangular projection—one for each face of a skybox. The images can be used in any modern 3D game engine.
lux is an image viewer for 'normal' images and the most common types of panoramic images, typically showing a 'rectilinear' view to the image data, which looks as if this view had been taken with an 'ordinary' lens.