incr widgets (aka iwidgets) consists of a series of Tk widgets, built out of other widgets using the incr Tk/incr Tcl foundation classes.
The source for iwidgets can be found at the http://sf.net/projects/incrtcl/ project CVS.
Also, see http://incrtcl.sourceforge.net/iwidgets
They include:
Has anyone worked on writing equivalents to these widgets using Ttk and some more recent megawidget infrastructure?