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pytradfri
IKEA Trådfri/Tradfri API. Control and observe your lights from Python. Examples available. On pypi. Sans-io.
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Home Assistant
:house_with_garden: Open source home automation that puts local control and privacy first.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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esphome
ESPHome is a system to control your ESP8266/ESP32 by simple yet powerful configuration files and control them remotely through Home Automation systems.
I used Google Home for a while, but honestly it was a pretty bad experience as time went on.
I've used Home Assistant[0] for the last 8-9 months. It works great and has support for every device I used with Google Home. It also has bridges so that you can still use Alexa, Siri, or Google Assistant for voice commands if you want that. The mobile app is good enough. It isn't as user friendly as Google Home, but it's not terrible and way more powerful.
You can run it on your own hardware, e.g. a NAS or Raspberry Pi, and they also sell purpose made hardware[1]
[0]: https://www.home-assistant.io/