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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.
And for the other direction, there's minimp3: https://github.com/lieff/minimp3
I've used minimp3 to implement a MP3 player on a STM32 microcontroller. Works great. :)
NOTE:
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Hence, a higher number means a more popular project.