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Re:Free Wolfram Engine for Developers by r-w on Tuesday May 21, 2019 @08:55PM (#19976747)
Using a Mac. Can confirm that almost everything that’s actually built upon by other stuff is open-source. Even much of Apple’s development software is open-source.
Re:Free Wolfram Engine for Developers by jonhendry18 on Tuesday May 21, 2019 @11:56PM (#19977619)
"Even much of Apple’s development software is open-source."

Not at the GUI level. Xcode and Instruments make use of open source toolchains underneath, but aren't open source themselves, nor are the Apple frameworks they're built on.