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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.
@DrAzzy
There are a shitload of them. Nowadays everyone and their mom has some custom ESP8266 board; they're all compatible with Espruino as long as they give you a way to load custom f/w
Just to mention a few dev-boards:
NodeMCU (which now might as well be generic - countless chinese vendors sell clones) is a very popular one. Unfortunately they have the pins numbered based on the nodemcu pin numbering, instead of the manufacturers GPIO numbers. Don't get me started on that.
Adafruit sells them under the name "Huzzah" - this is an ESP12 breakout without the serial adapter onboard (they also have the Feather Huzzah, an atmega32u4 tied to an ESP8266 on the serial port, and the Huzzah32, for the ESP32, which does have USB-serial adapter on it)
Sparkfun sells "ESP8266 Thing"