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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.
If you just purely want Spotify and you don't mind a bit of manual setup, you can buy some Raspberry Pis and install raspotify on them. They'll just show up in the Spotify app like any other Spotify connect device. The only requirement to use this is that the person playing music needs to have a premium account. Also it can only do one speaker at a time.
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.