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There's an experimental branch for Ruby: https://github.com/vnmakarov/ruby/tree/rtl_mjit_branch

Dalvik also uses a register-based bytecode. The early versions of Android needed a more efficient interpreter. Dan Bornstein's talk: https://www.youtube.com/watch?v=ptjedOZEXPM

A classic paper on Register vs Stack VMs: https://www.usenix.org/legacy/events/vee05/full_papers/p153-...

The Perl6 VMs (Parrot, MoarVM) are register based.

I believe Lua is as well.

Well, you can (kinda) do that if you have "direct access" to positions in the stack, so for example, say `add s[0],s[3]` (I think x87 had something like that)