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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.
I don't know of any. I've seen a few apps based on the Spotify API but they look sketchy. I would recommend using YT-DLP and downloading a bunch of music from Soundcloud so you can listen without being connected to some streaming service, and you can listen to music offline too with something like VLC.
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.