Yes, GIPSY [http://www.prs.de/int/products/gipsy/] is Tcl-based.



 What: VisualGipsy
 Where: <URL: http://www.prs.de/int/products/vg/ >
 Description: Visual GUI builder.  Uses Tk.
        Runs cross platform (Windows, Unix, MacOS).
        Uses the GNU Artistic License.
        Currently at version 2.6 .
 Updated: 02/2000
 Contact: <URL: mailto:info@prs.de >