[incr Widgets] (or iwidgets) is an object-oriented "mega-widget" set, or collection of high-level user-interface components, based on the popular Tk toolkit and the itcl/itk OO framework. Iwidgets contains over 50 ready-to-use mega-widgets including calendar, canvasprintdialog, combobox, fileselectiondialog, hyperhelp, notebook, radiobox, spinner, and many more.