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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.
I like the withings scales but they don't natively sync. Instead, I use https://github.com/jaroslawhartman/withings-sync on the command line which will upload weight, body fat, bone weight, etc. If you don't want any fuss then using Garmin hardware will be the least painful. The health interop/sync ecosystem is kind of a disaster across the board.
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