The specification of Mu.
RPySOM - The Simple Object Machine Smalltalk implemented in RPython
The prehistoric MicroVM (wasn't called Mu) prototype version 1, written in Python 2, with a Lua (subset) client.
The prehistoric MicroVM (wasn't called Mu) prototype version 2, written in Python 3, with a Lua (subset) client and a non-SSA-to-SSA converter.
ANU Haskell Compiler
RC Immix over Jikes RVM 3.1.4 release
scalloc written in rust!
ANU local development repo for DaCapo benchmark suite (https://github.com/dacapobench/dacapobench).
Jikes RVM (Research Virtual Machine)
An AOT compiler for Mu using LLVM.