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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.
Yes, and some folks are reverse engineering their stuff:
https://github.com/librerpi/rpi-open-firmware/
I stand corrected on the USB bit, actually -- it looks like you're using an alternate USB library which might avoid the licensing issue -- but some components of OpenAMP are provided under this license. Search for "SLA0044" to find the rest.
https://github.com/arduino/ArduinoCore-mbed/blob/e50ec8aa1b1...
NOTE:
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Hence, a higher number means a more popular project.