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Which of these is open source:
All of these
Mac OS X
Windows
Linux
Windows is a closed source operating system. Mac OS X (OS X El Capitan, iOS 9), which runs on the Darwin OS 15.6 (open source UNIX), is also closed source unless you compile it yourself using a separate GUI on Darwin. OS X is a hybrid open source really on this considering Apple (OS X developer) is the one releases the source.
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