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The OpenEnergyMonitor emonPi has been around a while and also quite good, and supports MQTT which I don't think IoTaWatt does.

https://guide.openenergymonitor.org/technical/emonpi/ https://openenergymonitor.org

[edit] I see it can use EmonCMS which is part of the OpenEnergyMonitor project.

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Have you seen any good mods for emonPi that increases the number of sensors? I really want to monitor every circuit in my panel (40)

Also would be interested in this. I've looked but haven't found anything that has 2 voltage inputs (for split-phase) and 20-40 current inputs. Tempted to build it myself, basically this[0], pared-down, pluggable into a common backplane that would have ethernet, but haven't got around to it yet.

[0] https://github.com/CircuitSetup/Split-Single-Phase-Energy-Me...

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