>  [1] http://puredata.info/

This one reminds me of HP VEE (no longer supported I'm thinking) and LabView
http://www.ni.com/labview/

>  [2] http://www.processing.org/
> 

Poking around here, I didn't see a GUI-based back end for programming
(looked like a text based API) but maybe I just didn't look hard
enough.

Some knowledge domains make GUI object based programming easier, as
when there's an implied pipeline, i.e. signal or data.

I suppose the *best* example of this using Python is ESRI's ArcView or
whatever the latest version is called.  Very graphical (drag and drop,
point to data sources, string together objects), plus generates Python
source code under the hood (one of the reasons I got to do a 3 hour
training for ESRI/GIS types last year).

Kirby
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