Visual Tcl 1.6.0
Visual Tcl is a freely available, high-quality application development environment for UNIX, Windows and Macintosh.
Since it was written entirely in Tcl and generates pure Tcl, porting should be either unnecessary or trivial.
Visual Tcl includes extensible widget and geometry manager support, support for the creation of compound widgets and widget libraries, a GUI interface for most aspects of Tcl/Tk development, and support for the importation of pre-existing Tcl/Tk code. Visual Tcl can export "Tclets," which will run in Netscape or MSIE.