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Smoothieware
Modular, opensource, high performance G-code interpreter and CNC controller written in Object-Oriented C++
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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.
Fwiw I wrote the runtime descriptor construction code for smoothie which is how I know it's possible - and yet even after a decade, I don't see any other firmware libraries with similar descriptor construction mechanisms which is sad.
NOTE:
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Hence, a higher number means a more popular project.