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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
I'd definitely recommend the ESP01, pinned Pico, breadboard and patch wires - it's all very cheap (well under £10 total) and very flexible.
There is of course http://www.espruino.com/WiFi if you want something with it all pre-installed