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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.
Bizarrely however, you need a magic text file to convince windows to actually use it with a particular device - despite the fact that USB was specifically designed for this to be entirely unnecessary as devices must describe themselves to the host on connect and there are many standardized interface patterns.
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.