TkDND is an extension that adds native drag & drop capabilities to the Tk toolkit. It can be used with any Tk version equal or greater to 8.3.3 and currently only the UNIX (X-Windows), Microsoft Windows (XP, Vista, 7) and OS X (Leopard) operating systems.
Please note that sources have been moved to: https://github.com/petasis/tkdnd
It works great! One thing that upsets me is the naming convention: it uses _ instead of camel case.
allows me to write interesting interactions in my Tcl program