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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 ...
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Ironclad OS project popping out Unix-like kernel in a unique mix of languages

There's more to safer systems languages than Rust If you're looking for a Unix-like, POSIX-compatible, real-time kernel, ...