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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.
You can see the code behind it here: https://github.com/lifehackerhansol/flashcard-bootstrap - I don't really understand it as I can't code in C, but it basically auto boots homebrew on your SD card :)
NOTE:
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Hence, a higher number means a more popular project.