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alltomp3-app
Download and Convert YouTube, SoundCloud & Spotify in MP3 with full tags (title, artist, genre, cover, lyrics 🔥)
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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).
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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.
Not really for Android but https://alltomp3.org/ is great
Sometimes it can be an antivirus issue you'd have to make an exception for, but if not give spotDL a look it works in the command line
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.