MacOS initially was developed by taking NextOS principles and porting over a 
file system that had the abilities to support MacOS 9 HFS file system. This 
allowed early Macintosh systems to run both UNIX and older Mac software in a 
that worked very similarly to VMWare Fusion in Unity view. Since Apple stock 
was under $5 a share and they had little capacity for development they created 
Darwin OS at the same time which  is a Open Source version of the UNIX parts of 
MacOS. Darwin is was at least originally based on a CMU micro kernel with a BSD 
set of commands often the GNU versions that were developed at MIT. The two 
major versions of BSD systems still out there are FreeBSD and OpenBSD. I 
believe that Darwin cooperated with the OpenBSD developers for a while, but I 
am not sure of that. Certainly in the late 1990’s most security folks I talked 
with preferred to build their own firewall systems on the OpenBSD platform and 
at least one VPN provider that I did consulting with used OpenBSD systems 
because trusted them to be more secure than other open source unix projects.

Sorry for nerding out here, I miss my UNIX work. 

Jonathan

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