Apple did open source Darwin years ago: https://en.wikipedia.org/wiki/Darwin_%28operating_system%29 https://en.wikipedia.org/wiki/Darwin_%28operating_system%29

Apple did open source Darwin years ago: https://en.wikipedia.org/wiki/Darwin_%28operating_system%29 https://en.wikipedia.org/wiki/Darwin_%28operating_system%29 http://www.puredarwin.org/ http://www.puredarwin.org/ There is one implication that Apple is currently rewriting kernel level that will need a huge effort and was discussed in HN.