KWWidgets is a free, cross-platform and open-license GUI Toolkit. It provides low-level core [widget]s, 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/images/4/43/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 ?

[SEH] 20060905 -- The package looks so new that it's hard to get in-depth info about it.  
It's the widget set used in the [vtk] project, packaged separately.  
My impression is that it can't be used in the Tk widget hierarchy, 
but a single application might be able to run separate Tk and KWWidget widget sets.

It sounds like it might be a strong alternative to anyone 
who might have been considering using [fltk] instead of Tk.  
It would also be interesting to get a thorough feature comparison with [Tile].

[NEM] Judging by the docs [http://www.kwwidgets.org/Wiki/KWWidgets/Overview#Object-Oriented],
it looks like it is built on top of Tcl/Tk and that kwwidgets are Tk widgets with some
bells and whistles. The code examples contain snippets like:

 pack [$widget GetWidgetName] ...

So, it looks like you can use standard Tk commands like [pack] with these widgets. I
would guess then that you can mix and match to some degree. It looks like a nice
package, although the Tcl API seems a bit clumsy in places (probably due to being
auto-generated from the C++ API).[http://www.kwwidgets.org/Wiki/KWWidgets/Examples/First_Look#Interacting_With_Tcl.2FTk]

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[Category GUI] [Category Package]