a work-in-progress Ruby compiler, written in Ruby and C++

Lua trace JIT compiler using LLVM-C

A simple fast Ruby implementation.

C99 just in time Python embeddable compiler with no external compiler dependencies so you can seamlessly use fast/existing C code from Python

The Purple VM, a custom JVM in C++.

PicoRuby is the smallest Ruby implementation for one-chip microcontrollers

mruby/c is another implementation of mruby.

rubex - A Ruby-like language for writing Ruby C extensions.

Simple and flexible programming language for applications development

WebAssembly Micro Runtime (WAMR)

A superset of Lua 5.4 with a focus on general-purpose programming.

ccint - a C/C++ interpreter, built on top of Clang and LLVM compiler infrastructure

The Neko Virtual Machine

Wren library implementing a subset of the W3C Web Platform

Linear algebra library, including multi-dimensional vector and 4D color classes, written in Wren

D bindings to the wren scripting language

Dirt simple package management/dependencies for Wren projects

Bite-sized QuakeC VM written in C

A tiny, embeddable language implemented in ANSI C

A fast, small, safe, gradually typed embeddable scripting language derived from Lua

V8 ahead-of-time compilation project

quickjs meets jit

The Dartino project was an experiment seeking to improve productivity when writing application code for embedded devices.

Python VM written in Swift