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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.
Someone else did say it too and I wouldn't have as much experience with it but Home Assistant is another option. I didn't like it because it ships with it's own Raspberry Pi image which is dedicated to just running Home Assistant, not as easy to just go in and create a script/mess around with Linux file system. OpenHab on other hand is a package which you install onto Raspbian. Id say Home Assistant is a bit less tailored to the DIY people but still has lot of customisable features.
Going to throw OpenHab suggestion in here, it is an open source software which can be used as a home management system. I have run it on a Raspberry Pi that acts as the hub but if you want to just give it a go first you can install it on windows/mac OS.