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Marlin
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.
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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.
Last I checked it's only in Prusa's fork of Marlin, not actual Marlin (see https://github.com/MarlinFirmware/Marlin/issues/8765 ) RRF has it too, calling it stall detection: https://duet3d.dozuki.com/Wiki/Stall_detection_and_sensorless_homing
You can take a look at my Switchwire Config with Sensorless homing active
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.