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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 haven't done anything with it for a while I'm afraid.
I'd strongly suggest buying an nRF51 devkit though - it'll make it much easier to flash the firmware onto the watch (and to read the original firmware first, so you can restore it later if you want to!).