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by Timmmmbob 4469 days ago
This is better IMO:

http://www.rfduino.com/

Despite their claims it is not really open source, but you can buy the official dev kit for $100 and it gives you access to the SDK, Soft devices and an SWD programmer (SWD is like JTAG but for ARM).

Great hardware though. The only alternative I've seen is the TI chips and they require the purchase of a $3k compiler!