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What other common or semi-common or simply not super-rare *nixes are there in desktop use aside from distributions of Linux, various BSDs and Mac OS X?

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This is going to hang on the definition of “super-rare”. “None” is a defensible answer, but it'll surely offend some of the users of these “super rare” unices. – Gilles May 31 '11 at 23:16
Do proprietary systems count? E.g. SCO? (sheesh, that felt like saying Voldemort, off to iron my hands) – Tim Post May 31 '11 at 23:25
Does Haiku (haiku-os.org) Count? Not sure it can technically be called *nix. – gabe. May 31 '11 at 23:41
Is OpenSolaris a BSD variant, or is it non-BSD/Linux? – Apophenia Overload Jun 1 '11 at 0:32
GNU/GNU Hurd. :) – boehj Jun 1 '11 at 12:42
up vote 5 down vote accepted

Solaris, or OpenSolaris.

A fairly interesting UNIX successor is the research OS Plan 9 from Bell Labs.

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