[wdb] As an Emacs fan, here the features I like mostly:

   * double-click on opening paren selects complete expr
   * speedbar shows procs and methods
   * command line allows quick tests

I uttered the question how to customize Emacs to accept not only procs 
but also self-defined xprocs etc, but I got no answer. 
The solution of learning Elisp would take me more time than to make a new environment in Tcl/Tk. 
So, here it is: yet another IDE [http://wolf-dieter-busch.de/html/res/Heimatseite/download/IDE.zip], written in pure Tcl/Tk, optimised only for Tcl/Tk, quick'n'easy.

[http://wolf-dieter-busch.de/html/res/Heimatseite/img/sw/ScreenshotTclIDE.png]

Written in pure Tcl/Tk such that you are not stuck to some special OO extension etc.
Documentation is not yet done, but will follow: [http://wolf-dieter-busch.de/html/Software/Tools/Tiny_TclTkIDE.htm]

'''Features'''

   * double-click, see above
   * Tab key on start of line invokes smart indent
   * directory window provides preview of procs in closed docs
   * keywords (method, proc ...) are hideable as well as namespace paths in directory window
   * command-line provides quick test

'''Moreover'''

These features are packaged such that they can be used separately (feel free to test them):

   * double-click -- changes Text bindings, see above
   * emacsIndent -- provides smart indent on Tab key
   * scrolledtext -- text widget with scrollbars
   * speedbar -- provides double-window with directory and file contents
   * consoleframe -- provides tiny console, not as top-level but as frame
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[Category Development] - [IDE]