Comment by bjcy

I'd be interested to hear your thoughts on LabVIEW, if you've ever used it: http://www.ni.com/labview/.

It's a graphical programming language with an emphasis on system design (for scientists and engineers) that uses a dataflow paradigm (amongst other things) and has a unique UI creation system.

(Disclaimer: I work for National Instruments and my comments here in no way reflect the views of National Instruments and yadda yadda.)