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A graphical user interface (often called a "GUI") is an interface for programs that uses windows, widgets, buttons etc. instead of using a command line as the interface. Apple and Microsoft made this type of interface popular by including it in their respective operating systems.

Qt[]

Graphical toolkit developed for Unix Systems. It was originally dual licensed although it is now under an open source licence. It is used in the KDE desktop.

GTK+[]

A Toolkit that came out of The Gimp project. It gained popularity as an open alternative to Qt. Used to create platform-independent code.

XUL[]

XML based language used by firefox and other Mozilla products.

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