Yeah, but I am speaking about the out of the box experience, and culture of people using those systems, not the do your own distro kind of thing that nowadays plagues Linux.
Or all the other UNIX clones that were basically UNIX System V (or BSD derived) + twm, latter CDE, with the only visible difference being the vendor's name.
I only consider NeXTSTEP and Irix as well on this box, from all big iron UNIX.