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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.
When I was new to ESP32 development, I found the videos at https://learnesp32.com/ to be very valuable. I felt very comfortable with ESP IDF development afterwards. Well worth $50.
NOTE:
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Hence, a higher number means a more popular project.