VisualGipsy

What: VisualGipsy

 Where: http://www.prs.de/prs/products/gipsy/
 Description: Visual GUI builder.  Uses Tk.
        Runs cross platform (Windows, Unix, MacOS).
        A "powerful yet easy to use GUI Builder for your Tcl/Tk applications".
        Uses the GNU Artistic License.
        Currently at version 2.6 .
 Updated: 02/2000
 Contact: mailto:info@prs.de

(Juli 2007) Visual Gipsy seems to be available only as part of GIPSY. http://www.prs.de/prs/products/gipsy/gipsy_technic.php?lang=en