Qt

Qt (pronounced as the English word "cute") is a cross-platform application development framework, widely used for the development of GUI programs (in which case it is known as a widget toolkit), and also used for developing non-GUI programs such as console tools and servers. Qt is most notably used in KDE, Opera, Google Earth, Skype, Qt Extended, Adobe Photoshop Album, VirtualBox and OPIE. It is produced by the Norwegian company Qt Software, formerly known as Trolltech, a wholly owned subsidiary of Nokia since June 17, 2008.