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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 do this with a cheap (~$20) USB RTL-SDR – no Arduino or custom electronics necessary. Of course, I only use it to monitor my own energy usage (electricity and gas), using rtlamr[1] and a script that periodically sends the data to InfluxDB, then displayed using Grafana.
The result is a cheap smart home energy monitor that doesn't require any clamps near the electricity panel, and it exactly matches the usage for which I'll be billed.
[1] https://github.com/bemasher/rtlamr
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