Issue #13527: remove mention of Python megawidgets and Tkinter3000 WCK

from the doc. These two projects appear dead.

Doc/library/othergui.rst

@@ -3,34 +3,8 @@
 Other Graphical User Interface Packages
 =======================================
 
-There are an number of extension widget sets to :mod:`Tkinter`.
-
-.. seealso::
-
-   `Python megawidgets <http://pmw.sourceforge.net/>`_
-      is a toolkit for building high-level compound widgets in Python using the
-      :mod:`Tkinter` module.  It consists of a set of base classes and a library of
-      flexible and extensible megawidgets built on this foundation. These megawidgets
-      include notebooks, comboboxes, selection widgets, paned widgets, scrolled
-      widgets, dialog windows, etc.  Also, with the Pmw.Blt interface to BLT, the
-      busy, graph, stripchart, tabset and vector commands are be available.
-
-      The initial ideas for Pmw were taken from the Tk ``itcl`` extensions ``[incr
-      Tk]`` by Michael McLennan and ``[incr Widgets]`` by Mark Ulferts. Several of the
-      megawidgets are direct translations from the itcl to Python. It offers most of
-      the range of widgets that ``[incr Widgets]`` does, and is almost as complete as
-      Tix, lacking however Tix's fast :class:`HList` widget for drawing trees.
-
-   `Tkinter3000 Widget Construction Kit (WCK) <http://tkinter.effbot.org/>`_
-      is a library that allows you to write new Tkinter widgets in pure Python.  The
-      WCK framework gives you full control over widget creation, configuration, screen
-      appearance, and event handling.  WCK widgets can be very fast and light-weight,
-      since they can operate directly on Python data structures, without having to
-      transfer data through the Tk/Tcl layer.
-
-
-The major cross-platform (Windows, Mac OS X, Unix-like) GUI toolkits that are
-also available for Python:
+Major cross-platform (Windows, Mac OS X, Unix-like) GUI toolkits are
+available for Python:
 
 .. seealso::