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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.
Completed kits are sold on their eBay page (link on their GitHub).
This seems to much similar to the https://github.com/skiselev/micro_8088 because both use "FARADAY" chipset, which makes BOM much smaller. The original "FARADAY" chipset is hard to find now but I have seen "PROTON" version of that but there are slight to be addressed changes. It is readily available for around USD 20.
NOTE:
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Hence, a higher number means a more popular project.