Here are links to some pages in [the Tcler's Wiki] which give Tcl/Tk code examples. 
See also [Tk syntax help] - [Widgets in the initial Tk package] - [Tcl examples] - 
and just look around; e.g. [RS] is too lazy to bring all examples to this page too. -
''RS: Maybe lazy, but there's so many of them... 
All my fun projects, Tk or not, are listed on the [RS] page.''


'''Button widget'''
   * [Simple Launch Pad]

'''Text widget'''
   * [Text widget example] - with editor menu
   * [A change-sensitive text widget]
   * [Read-only text widget]
   * [A little hypertext system]
   * [A little spellchecker]
   * [Text widget syntax highlighting]
   * [Text Widget Undo/Redo]
   * [A minimal editor explained] - [A little Unicode editor] - [A little Korean editor]

'''Canvas widget'''
   * [Affine transforms on a canvas]
   * [An analog clock in Tk]
   * [Canvas pixel painting]
   * [A little checker game]
   * [A little Yahtzee game]
   * [Describing and rendering flags in Tcl]
   * [A little function plotter]
   * [Moon Lander]
   * Musical [notes on a canvas]
   * [Photo gradients]
   * [Turtle graphics the Logo way]
   * [Model railroading with Tcl] - a running steam locomotive; [trains3.tcl] 
   * [Postcard from Switzerland]
   * [ReadME - a simple online character recognizer]
   * [Playing UML]
   * [A symmetric doodler]
   * [Etwas Warmes braucht der Mensch]
   * [Xmas Stars]
   * [3dviewer : A canvas only viewer of 3D data]

'''Others'''
   * [A little calculator]
   * [An entry with a history] (bound to cursor keys)
   * [A little spreadsheet] - recomputes sums on each keystroke
   * [A minimal console]
   * [Menus made easy]
   * [Scroll bars that appear only when needed]
   * [Paning widgets]
   * [Listbox navigation by keyboard]
   * [An i15d date chooser] - with canvas, checkbutton, radiobuttons
   * [A minimal table example] with a binding for row selection
   * [Iching_fortunes]




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[Category Example] - [Arts and crafts of Tcl-Tk programming] - [Tk Gems]