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Tcl (Tool Command Language) is a cross-platform (Unix/Windows/Macintosh/and more...) interpreted scripting language and a very portable interpreter for that language. Tcl is embeddable and extensible, it was created by John Ousterhout in 1988 and is used by companies and organizations world-wide.
Mac Tcl/Tk: see links on DanielSteffen
Links updated by Neil Madden [http://wiki.tcl.tk/NEM] (5Feb04) to point to current locations.