Unix / Linux history ?

I know linux pretty well so I was trying to understand what happened before and up to the creation of GNU/Linux. What I am curious about is what unix os's are open source. Going by this chart File:Unix history.svg - Wikipedia, the free encyclopedia I am wondering other then the GNU/linux , Hurd , minix , and the GNU project what other stuff is open source. Like is any of the BSD os's , AIX , HP-UX , IRIX...etc open source? Or is it just the GNU/linux stuff on the chart?

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