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Nabu Casa joins the Z-Wave Alliance
(www.home-assistant.io)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
The first few devices I bought were z-wave. £40 for the radio, and £40-ish for the devices.
I would not recommend starting that way! I nearly balked at the cost of the radio.
However, it did work out, as my main heating control is z-wave, and stability in that is really important.