QuickTime is an extensible multimedia framework developed by Apple Inc., capable of handling various formats of digital video, picture, sound, panoramic images, and interactivity. The classic version of QuickTime is available for Windows XP and later, as well as Mac OS X Leopard and later operating systems. A more recent version, QuickTime X, is currently available on Mac OS X Snow Leopard, Lion, and Mountain Lion.
Read more about QuickTime: Overview, QuickTime Framework, PictureViewer, File Formats, History, Bugs and Vulnerabilities