[incr Widgets] is an object-oriented mega-widget set which extends Tcl/Tk and is based on [incr Tcl] and [incr Tk]. This set of mega-widgets delivers many new, general purpose widgets like option menus, comboboxes, selection boxes, and various dialogs whose couterparts are found in Motif and Windows. Since [incr Widgets] is based on the [incr Tk] extension, the Tk framework of configuration options, widget commands, and default bindings is maintained. In other words, each [incr Widgets] mega-widget seamlessly blends with the standard Tk widgets. They look, act and feel like Tk widgets. In addition, all [incr Widgets] mega-widgets are object oriented and may themselves be extended, using either inheritance or composition.