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cncjs
A web-based interface for CNC milling controller running Grbl, Marlin, Smoothieware, or TinyG.
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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.
Candle has a Linux version (haven't tested yet).
I haven't got the GRBL extension to work on Octoprint (didn't accept commands, Unlock, etc.). Also, I believe is more laser focused than milling focused. An alternative is cncjs that runs on Win, Mac, Linux and Raspberry Pi.
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.