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Home Assistant officially Matters
(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
I originally started that way too but ZigBee has been super reliable for me and faster than my Z-wave network. I think it really depends on what devices you have and if one is misbehaving.