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Marlin
Optimized firmware for RepRap 3D printers based on the Arduino platform. (by InsanityAutomation)
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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.
You could also have a look at this repo for newer precompiled Ender 6 firmware: https://github.com/InsanityAutomation/Marlin/tree/CrealityDwin_2.0
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.