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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.
https://github.com/qmk/qmk_firmware (tons of boards these days run qmk or some fork of it)
https://github.com/zmkfirmware/zmk (firmware primarily for wireless)
https://github.com/KMKfw/kmk_firmware (firmware written in CircuitPython)
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.