Over the years a range of GUI’s have been developed for different operating systems such as OS/2, Macintosh, Windowsamiga, Linux, Symbian OS, and more.
via Operating System Interface Design Between 1981-2009 | Webdesigner Depot.
For it’s time, NeXTSTEP was surprisingly… coloured. Take a look at the difference between NeXTSTEP and OS/2… :p
For it’s time,