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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.
@AlexOwen
All the details are in the link (I hope). It passes messages between devices, so say you want to turn on all the lights in your house (for example), you can send a single message to the hub with a CSS selector in it to turn them all on.
It's deliberately very versatile. It's a framework and a few libraries to enable you to build large projects in a relatively simple way, in a way that is at least semi standard and open.