Yes, GIPSY [L1 ] is Tcl-based.
What: VisualGipsy
Where: http://www.prs.de/int/products/vg/index.html [[URL broken]]
Description: Visual GUI builder. Uses Tk.
Runs cross platform (Windows, Unix, MacOS).
Uses the GNU Artistic License.
Currently at version 2.6 .
Updated: 02/2003
Contact: mailto:[email protected]
See also IDE - even though this isn't an IDE, often times people use that term to mean "program that I can use to create GUI applications".