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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
Sort of... The chips you'll need are different (they're STM32 chips) and actually you don't need an Arduino or Espruino to program them - you just need a USB->TTL converter (about $5). There's info on it at http://www.espruino.com/Serial+Bootloader
Having said that, the STM32 chips are not breadboard-friendly - in fact they're all the same pin spacing or smaller than the chip on the Espruino board, so you can't solder them to protoboard, and hand-soldering is difficult (although not impossible).