Darwin, the open-source operating system UI underneath both macOS and iOS, is based on FreeBSD and the XNU kernel, plus some NextStep stuff. And of course FreeBSD is based on BSD, which was a patch set derived from the original AT&T Unix.
It's amazing that in 2016, the two major consumer computing platforms are BSD and Linux, and Windows in struggling to catch up.
It's amazing that in 2016, the two major consumer computing platforms are BSD and Linux, and Windows in struggling to catch up.