QT

Qt (pronounced "cute" by its creators[1]) 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.[2]

Qt uses C++ with several non-standard extensions implemented by an additional pre-processor that generates standard C++ code before compilation. Qt can also be used in several other programming languages; bindings exist for Ada (QtAda),[3] C# (Qyoto/Kimono), Java (Qt Jambi),[4] Pascal, Perl (Perl Qt4),[5] PHP (PHP-Qt), Ruby (QtRuby), and Python (PyQt). It runs on all major platforms, and has extensive internationalization support. Non-GUI features include SQL database access, XML parsing, thread management, network support and a unified cross-platform API for file handling.