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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.
Vimusic. It's a sweet spot between streaming and offline as it lets you stream from YouTube music and automatically saves the songs you play for offline playback. Best part is that you can specify how much space saved music takes up before the app removes the least played songs. I personally don't care for the recent UI update but I think it's worth checking out
I use the program called Emby on an old laptop and it actually loads songs faster than Spotify when on 4G. I used a python script called SpotDL to download my entire spotify library as MP3s.
Great UI and minimalistic Try this: https://github.com/z-huang/InnerTune