A list of online books on Tcl:
Google books has a lot of Tcl books here .
Tcl/Tk Tutorial in german languageLutz Wegner wrote a course script about programming of GUIS using Tcl/Tk : Lutz Wegner: Programmierung grafischer Benutzerschnittstellen mit Tcl/Tk .
The announcement page of the curse also contains some other links like the script of the Tcl/Tk programming curse at the University of Bielefeld: [L5 ]
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