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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
Honestly, I'd say buy an official nRF52832DK: https://www.nordicsemi.com/About-us/BuyOnline?search_token=nRF52-DK
I believe they're basically sold at cost price so you get quite a lot for your money. As well as all the proper segger dev tools they also just appear as a USB disk, so you can just copy the hex file on to flash the device - no software needed.
Otherwise if you want to go cheap you can use a Raspberry Pi and OpenOCD, but be prepared for a bit of messing around!