Develop cross-platform CLI and GUI tools with Tcl/Tk
Tcl, or the Tool Command Language, created and released by John Ousterhout in 1990, deserves a place among the greatest products of the human mind. Especially when combined with its better known graphical user interface Toolkit - Tk. In 1997 Ousterhout was awarded the ACM Software System Award for Tcl/Tk, an award given to institutions or individuals recognized for developing software systems with a lasting influence, reflected in contributions to concepts, in commercial acceptance, or both.
Armen Barsegyan
Everything you could ever possibly want to know about Tcl/Tk. There's nothing to add here; if this is up your alley - and you know if it is - just go ahead and read it, and stop wasting time here.