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Also Zigbee and Z-Wave.

Zigbee got problems with non-free licensing. Z-Wave seems open, is it completely open?

Z-Wave is very closed, afaik only a few chips are available and need to be licensed. Compared to that Zigbee seems to be much more open.

Ok. The top thread of this HN post about Zigbee not being that open:

Zigbee is IEEE 802.15.4, you can also run 6LoWPAN on top instead of the Zigbee stack.