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There's Deegen, which is being used to build a LuaJIT successor. https://github.com/luajit-remake/luajit-remake

From what I gather, Deegen is independent of the VM in that repo, but lives there afaik.

I mailed the authors a few months ago and indeed, it lives there but is independent-ish. They don't consider it ready to use for anything else other than experiments, though.

It is utterly baffling that people are downvoting this comment.

The repo I link to here is by Haoran Xu, one of the authors of the paper.

Y'all need to chill out.

Blog post about the approach here: https://sillycross.github.io/2023/05/12/2023-05-12/

I think libgccjit uses this technique or can use it: it reminds me of things I read about the elisp JIT in newer versions of emacs

Cpython in beta

Sure but from looking at the patches, it seems like theirs is tied into the CPython build and infrastructure. I am talking about a dedicated library which can be dropped into a variety of superprojects to help them implement a JIT.