Graal & Truffle
Truffle is a framework for writing interpreters with annotations and small bits of extra code in them which, when Truffle is paired with its sister project Graal, allow those interpreters to be converted into JIT compiling VMs … automatically. The resulting runtimes have peak performance competitive with the best hand-tuned language-specific compilers on the market. For example, the TruffleJS engine which implements JavaScript is competitive with V8 in benchmarks. The RubyTruffle engine is faster than all other Ruby implementations by far. The TruffleC engine is roughly competitive with GCC. There are Truffle implementations in various stages of completeness
via https://medium.com/@octskyward/graal-truffle–134d8f28fb69