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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.
The arduino documentation is (or was back when i did a lot of work with arduinos) very thorough. Book mark the reference material https://www.arduino.cc/reference/en/ its very handy to have close at hand.
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.