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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.
In addition, there's the TinyML youtube channel (although it's not geared towards beginners), or this free online course if you like the MOOC style, or this lecture series on youtube.
NOTE:
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Hence, a higher number means a more popular project.