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Marlin
Discontinued Marlin is an optimized firmware for RepRap 3D printers based on the Arduino platform. | Many commercial 3D printers come with Marlin installed. Check with your vendor if you need source code for your specific machine. (by tititopher68-dev2)
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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.
BTW, the Jyers firmware is starting to get a little out of date. The work is being continued at https://github.com/tititopher68-dev2/Marlin/tree/new_feature but you will unfortunately need to compile your own. Something at least to think about!
NOTE:
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Hence, a higher number means a more popular project.