ReactOS as the open-source project striving for binary compatibility with Windows applications/drivers is still working away in 2022 on symmetric multi-processing (SMP) support.
Proper SMP/multi-core support is obviously critical for today';s hardware or even anything in the past roughly two decades… It';s also been a pain point for ReactOS, but fortunately the situation is improving.

We';re still looking at very early code that';s not even merged yet, but once it has - this would be a massive leap forward for the project.

https://www.osnews.com/story/134671/reactos-making-progress-on-smp-multi-core-support/

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