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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
Hi - yes, the firmware update app works well and is a bit faster BUT it requires that the bootloader on your Bangle is a certain version. The app can update that too but I haven't yet built in a one-click option for doing it (which I should do soon).
If you're doing a lot another option is to use an 'nRF52DK' board and the SWD ports on the back of the watches. In that case it's only around 20 sec a watch.