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Expandable-6-Channel-ESP32-Energy-Meter
Hardware & Software documentation for the CircuitSetup Expandable 6 Channel ESP32 Energy Meter. Works with ESPHome and Home Assistant.
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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.
If you want more accuracy and slightly less diy then https://circuitsetup.us/index.php/product/expandable-6-channel-esp32-energy-meter/ would be the way to go. It's a little spendy, but it works a treat and gives you more info than just CTs would (active power, reactive power, frequency, etc)
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.