A '''[GUI] Toolkit''' provides facilities for creating and maintaining GUI's. [Tk], which was created expressly for [Tcl] by [John Ousterhout], is the predominant [GUI] toolkit for [Tcl].

** GUI Toolkits **

   [Tk]:   going strong for over two decades, and still considered by many to be the most productive tool for [GUI] development

   [Fox Toolkit]:   cross-platform, licensed under the [LGPL], written in [C++], focused on using a low-level interface on supported platforms, no Tcl bindings yet

   [Qt]:   cross-platform, dual-licensed, written in [C++]

   [wxWidgets]:   cross-platform, license similar to but more permissive than [LGPL], written in [C++]

** See Also **

   [Alternative GUI toolkits]:   could probably be folded into this page

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