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This UNIX-based operating system looks like it's from the 90s, but it's still receiving updates

First launched in 2018, the open-source SerenityOS offers its users a stripped-back GUI-based operating system that melds a 1990s desktop aesthetic with a focus on productivity for power users. It isn ...
Neowin

A quick look back at Microsoft's first computer operating system, Xenix

Long before Windows, and even before MS-DOS, Microsoft sold a Unix-based operating system it called Xenix in 1980. It was the first OS made by the company, but it eventually sold it off in 1987. On ...