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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.
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owntone-server
Linux/FreeBSD DAAP (iTunes) and MPD media server with support for AirPlay 1 and 2 speakers (multiroom), Apple Remote (and compatibles), Chromecast, Spotify and internet radio.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
Well, it’s a slightly odd use case in that normally the server would just be the server and not also the player, but given the kit you’ve got it makes sense. Probably what you want is MPD plus one of the MPD web clients.
And bluez for the Bluetooth part
Are you looking for something like this?