Visual Tcl (vtcl) is a visual application development environment written entirely in TCL/Tk and generating pure TCL/Tk code. Therefore, both vtcl itself and applications produced by it are 100% portable. It can import existing TCL code, and can export TCLets which run inside Netscape or MSIE.
> % Then again, maybe you should
> % have a look at Tcl/Tk in turn.
> You're right. Can you think of a good
> example of a Tcl/Tk app that I should
> look at?
Written entirely in Tcl/Tk with no further C extensions.