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Marlin
Optimized firmware for RepRap 3D printers based on the Arduino platform. (by InsanityAutomation)
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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.
This one is pretty decent - https://github.com/InsanityAutomation/Marlin/blob/CrealityDwin_2.0/README.md
NOTE:
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Hence, a higher number means a more popular project.