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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
Potentially, yes. There isn't a port yet though.
Having said that the STM32F2 isn't that well supported by Espruino - the F4 and F1 series are handled much better. You might find it a bit of an uphill struggle.
If you want to play around with Espruino on a watch you could re-flash an nRF51 based watch/fitness tracker: http://forum.espruino.com/conversations/280747/