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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'm using v 2.8 of Nick O'Leary's pub/sub client (https://github.com/knolleary/pubsubclient). Other libraries are what gets installed from the install of the toolchain. In the case of Arduino this is apt install arduino on Debian and installing the PlatformIO toolchain via the VS Code extension installer.
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.