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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.
I learned from looking at example code in the Arduino IDE (a really good and free code editor https://www.arduino.cc/en/software). The Arduino IDE allows you to add more boards (like ESP32, ESP8266, Tiny etc.) so you're not limited to using only their Arduino boards.
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.