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Marlin_Ender3v2
Discontinued This is an optimized firmware for Ender 3v2 3D printers. [Moved to: https://github.com/mriscoc/Ender3v2]
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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.
2: First cube with Klipper, unknown settings, most likely untouched default (https://github.com/Klipper3d/klipper/blob/master/config/printer-creality-cr10s-2017.cfg)
https://github.com/mriscoc/Marlin_Ender3v2/releases has a very interesting view on Marlin for the Ender series, if that's your jam.
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.