This  package contains  [incr Widgets]  version 4.0.1.  [incr
Widgets] is  a companion to  [incr Tk] and  provides a widget  set, with
many improved  widgets. The [incr  Widgets] collection is also  known as
``iwidgets'' or "mega-widgets".

WWW: http://sourceforge.net/projects/incrtcl/