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rtaudio
A set of C++ classes that provide a common API for realtime audio input/output across Linux (native ALSA, JACK, PulseAudio and OSS), Macintosh OS X (CoreAudio and JACK), and Windows (DirectSound, ASIO, and WASAPI) operating systems.
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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.
They could have used RtAudio.cpp/.h from STK, audio support that works on Linux, Mac and Windows. See https://github.com/thestk/rtaudio/blob/master/RtAudio.cpp
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