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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. (by LCh-77)
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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.
Another very popular Marlin based firmware is the "Professional Firmware" by mriscoc. I've only looked at it briefly, but seems an extremely capable firmware with active development.
The thing I love about Jyers is it's straightforward and just works (for me at least). Bed levelling and mesh creation is easy, the UI is clean and easy to navigate. Jyers seems to have gone silent recently, but LCh-77 has picked up the baton and created an advanced version based on Marlin 2.1