Impressive curation effort. One comment: at least a few of the examples in the gallery seem to be of the "last, greatest" version, which actually isn't necessarily the greatest, and definitely not the most interesting.

For example, the "Domain_OS SR10.4 - 01 VUE desktop" is a bit confusing, and may cause people to miss actual DomainOS.

Apollo DomainOS (or Domain/IX, or simply Domain) had many unique and interesting things about it, but disappeared soon after being acquired by HP. It looked more like it might look if you took a programmer who had mostly only seen text terminals, and gave them a megapixel display with pixel framebuffer, a mouse, and the freedom to design the keyboard hardware, and told them to make what they would want to use.

VUE (around when the Unix workstation vendors collaborated on standarding on a common desktop environment) was for HP-UX , which was a very different operating system, and entirely different user experience. More of an early attempt at let's give non-power-users an accessible computer with virtual desktops and everything.

Similarly, Solaris had innovative OpenWindows (including but not limited to a networkable display system based on PostScript) before they got the common desktop environment.

SunOS 4.x (retronym "Solaris 1.x") and earlier could run the earlier SunView environment, which was more like monochrome early Mac than the later Open Look look and feel of OpenWindows.