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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
Yes, I just used an STM32F4Discovery board. You just pull 2 jumpers off, then it's 2 wires and ground. OpenOCD seems a bit crazy though - I ended up trying to dig the relevant command-line out of Adafruit's tools.