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spotube
🎧 Open source Spotify client that doesn't require Premium nor uses Electron! Available for both desktop & mobile!
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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.
Reading through some of the code, it seems that it uses Spotify as a means to grab additional data such as lyrics, playlist information, and more. It streams the audio from YouTube, but a lot of the rest looks like it's Spotify alright. For example, the code snippet linked there shows it matches YouTube URLs to Spotify IDs and merges data from both. Not quite sure it's misleading, but it's definitely an interesting approach.