Michael Kjörling wrote:
And all this, of course, ignoring the other issue of
what might be
considered a "start to the open source operating system movement",
given that even development of GNU was well underway by the time the
Linux kernel got started (having been worked on since early 1984)
GNU planned to adopt TRIX which was developed at MIT in the mid 1980s.
I don't know its exact distribution terms, but Wipikedia says "open
source" so it was possibly in that general vicinity.
Arguably ancient PDP-10 operating systems like ITS, WAITS, TENEX were
somewhat "open" and "free", but it's not a clear cut case.