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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.
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If you want to get into other aspects - the bl808 from bouffalo labs is a Triple core ASP (not SMP!) CPU with 64MB of ram (!) for $8. It can run Linux and but still needs a lot of drivers written, from areas like clocks through to SPI/I2C etc. https://github.com/openbouffalo/linux
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Hence, a higher number means a more popular project.