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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.
There is lots of software to choose from, I suggest you have a look at Mainflux, and Mosquitto is popular for broker. Thingsboard is a turnkey solution, it's nice in some ways, but also very slow and heavy. Other options to research in this wikipedia article.
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.