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In computer programming, widget toolkits (or GUI toolkits) are sets of basic building elements for Graphical User Interfaces. Typical Widgets Windows Menus[?] Buttons[?] Combo boxes[?] Radio boxes[?] Icons[?] Popular Widget Toolkits High-level widget toolkits The Abstract Windowing Toolkit is used in Java applications. It will typically use another toolkit on the selected platform in turn. Cocoa - used in MacOS X GNUstep GTK used in GNOME MetaCard[?] The Microsoft Foundation Classes[?] (MFC) contain several useful widgets Motif used in the Common Desktop Environment The Object Windows Library[?] is sort of Borland's alternative to MFC The Visual Component Library[?] (VCL) is Borland's toolkit used in its C++ Builder and Delphi products. Qt used in KDE Swing[?] is Sun's replacement for AWT in newer Java versions Tk a widget set accessed from Tcl WINGs[?] WINGs Is Not GNUstep wxWindows[?] abstracts toolkits across several platforms for C++ and Python Low-level widget toolkits The Windows API used in Microsoft Windows The X Window System contains primitive building blocks, but they are almost always accessed using either Motif, GTK or Qt. (what does macintosh use?) External Links A GUI Toolkit Framework Page (http://www.geocities.com/SiliconValley/Vista/7184/guitool.html)