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OctoPrint-PSUControl
Smart control of your power supply via GPIO, GCODE Command, System Command, or variety of sub-plugins.
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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.
Also, if you're willing to play with some wire cutters you can use a plugin for OctoPrint to turn on/off your 3D printer directly from the OctoPrint web interface. (Although if you go with the docker container you'll need to pass through GPIO control for this to work by mounting /dev/gpiochip0).
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.