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youtube-music
YouTube Music Desktop App bundled with custom plugins (and built-in ad blocker / downloader)
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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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spotify-downloader
Download your Spotify playlists and songs along with album art and metadata (from YouTube if a match is found).
I solved both of these by using a third party app that also allows you to download any song/album and has a bunch of cool plugins.
InnerTune, a FOSS YouTube music client
I use https://github.com/spotDL/spotify-downloader to download and convert my spotify playlists to mp3 or flac files.
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.