C, MIT license
This is the MicroPython project, which aims to put an implementation of Python 3.x on microcontrollers and small embedded systems. You can find the official website at micropython.org.
MicroPython implements the entire Python 3.4 syntax (including exceptions, with, yield from, etc., and additionally async/await keywords from Python 3.5 and some select features from later versions).
MicroPython - Python for microcontrollers
Overview — MicroPython latest documentation