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grbl
An open source, embedded, high performance g-code-parser and CNC milling controller written in optimized C that will run on a straight Arduino
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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.
GRBL: https://github.com/grbl/grbl (not sure what category this falls under)
Software: bCNC, cncjs, a couple others
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.