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BlackHole
BlackHole is a modern macOS audio loopback driver that allows applications to pass audio to other applications with zero additional latency.
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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.
It's not what you're after but if you are only interested in ripping audio from YouTube rather than from what's playing you can use yt-dlp: https://github.com/yt-dlp/yt-dlp
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.