KWWidgets is a free, cross-platform and open-license GUI Toolkit. It provides low-level core widgets, advanced composite widgets, and high-level visualization-oriented widgets that can be interfaced to visualization libraries like VTK. KWWidgets is an object-oriented C++ toolkit that can interact and co-exist with Tcl/Tk directly from C++. It is wrapped automatically into a Tcl package, and therefore can be used directly from Tcl/Tk also, allowing for fast-prototyping and scripting.

KWWidgets an be compiled on a large number of platforms, including Windows, Mac, and many flavors of Unix/Linux systems. It is open-source and uses the same BSD-style open-license as VTK. It is available for free and can be downloaded without restrictions.

Like many other GUI toolkits, it provides low-level core widgets like buttons, entries, scales, menus, combo-boxes, thumbwheels, spin-boxes, trees, notebooks and multi-column lists to name a few. Unlike many of those toolkits though, it also provides advanced composite widgets like toolbars, tooltips, progress gauges, split-frames, splash-screens, 2D/3D extents, color pickers, histograms, windows and dialogs. 

Available at: [http://www.kwwidgets.org/Wiki/KWWidgets]

[http://www.kwwidgets.org/Wiki/images/3/3e/KWWidgetsCoreWidgetsOverview.png]

[http://www.kwwidgets.org/Wiki/Image:KWWidgetsVTKWidgetsOverview.png]

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[APN] Some of the high level widgets look pretty useful. Can these be used together with Tk widgets ? If so, at what level of integration (placing a kwwidget inside a Tk toplevel eg.) ? Also, the look and feel seems to follow the older versions of Windows. Does it have theme support ?