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There are quite a few decent active Ruby Implementation going on at the moment.

CRuby with MJIT

MIR ( This )

JRuby ( Ruby on JVM )

TruffleRuby ( Ruby on Graal )

Artichoke ( Ruby on Rust )

And I remember someone mentioned making Ruby with Tracing JIT. ( Not Topaz ) Unfortunately My Google fu is not good enough I can no longer find it.

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Rubinius. Here are Evan’s slides from the 2009 LLVM developer conference:

https://llvm.org/devmtg/2009-10/Phoenix_AcceleratingRuby.pdf

EngineYard took Rubinius in a few directions, but I think the main lasting impact was all the RSpec work they did along the way.

Edited my original post. I meant Implementation that are still actively developed. Both Rubinius and Topaz are no longer being maintained.

I believe Rubinius _is_ being maintained (again), it's just going in a direction very different from Ruby.

Yes, there are quite a few Ruby implementations but MIR is not one nor is it trying to be. It's a standalone library useful for use in a tier 1 JIT for any dynamic language, along with other uses outside of JITs having to do with native code generation. The author does have plans to integrate it into CRuby to work alongside MJIT.

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