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Run your own Multics:

https://multics-wiki.swenson.org/index.php/Main_Page

There are also several public access Multics systems up and running.

[musicale]

I've had it running in an emulator for a while, but not natively sadly.

It would be fun to have an FPGA implementation of the hardware, and/or a port of the system to modern (or relatively modern) processors that are generally available (perhaps some x86 processors that support segmentation.)

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An FPGA implementation is underway.

The X86 segmentation facility resembles Multics segments in name only.