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Used QNX 15+ years ago. The supposed best value is micro-kernel. Kernel is very small, all the device drivers, file system, TCPIP stack are run in user space outside the kernel.

I have not used AmigaOS and no clue if it has the same micro kernel design.

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Sort of, but AmigaOS didn't have memory protection so the distinction doesn't mean much as the distinction between supervisor and user mode on a plain m68000 is very minor.

We have Fuchsia now.

As great as Fuschsia’s architecture (the Zircon kernel) may be, I’ve yet to see any devices that come with it.

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