What: incr Tk Slate megawidget
Where: http://ptolemy.eecs.berkeley.edu/%7Ejohnr/code/slate/
Description: The Slate is an [incr Tcl] megawidget layered over the Tcl/Tk
canvas. It contains visual hierarchy, symbolic item aspects and
interaction support. Release 3.0alpha supports
Tcl 8.0 or [incr Tcl] 3.0.
Updated: 07/1998
Contact: mailto:[email protected] (John Reekie)
The link above appears to be broken, althought http://ptolemy.eecs.berkeley.edu/~johnr Still points to John's web page.