PAGE is a drag-and-drop GUI generator for Python and Tkinter aimed at building Python modules which can display a relatively simple GUI constructed from Tk and ttk widget sets using the Place Geometry Manager.
Wow, I'm glad I found this. This saves so much time getting the UI modelled and is right up to date with features too. Personally, I prefer a singe IDE window than disparate widgets on the desktop but hey, it works quite well, and has saved my sanity from looking at tk books for parameters and settings.
Easy for use.
Makes easy build Python rich interface for Scribus Scripter, the FOSS desktop publishing.