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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.
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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.
Here you go
About GPL: Its hard to find any code for most (EDIT: Creality) printers right now. E.g., the Ender 5 Pro repo is just a joke (https://github.com/Creality3DPrinting/Ender-5-Pro)
For the Ender 6 they didn't even bother to create a repo anymore, and it took FOR EVER to get support in mainline Marlin (https://github.com/MarlinFirmware/Marlin/pull/20512).