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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
The link @Robin gave should do you - I believe RAK also have some info on getting started on their website (although if I'm honest I'm having difficulty finding it now).
The official Espruino boards come pre-installed, but most others (like the RAK ones) have to be loaded up manually.