Tcl is the open-source scripting language AlphaTcl is written in.
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.
Tcl links
Mac Tcl/Tk: see links on DanielSteffen
das 1/4/01
Links updated by Neil Madden [http://wiki.tcl.tk/NEM] (5Feb04) to point to current locations.