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board-mini
Discontinued built around the STM32F103CBT6 MCU, the board::mini is the first series in the bmc::board project.
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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 also a crowdfunding campaign currently ongoing, although you can of course produce them yourself. Everything you'd need is in the GitHub repo.
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.