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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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bazarr
Bazarr is a companion application to Sonarr and Radarr. It manages and downloads subtitles based on your requirements. You define your preferences by TV show or movie and Bazarr takes care of everything for you.
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listenbrainz-server
Server for the ListenBrainz project, including the front-end (javascript/react) code that it serves and all of the data processing components that LB uses.
I'm going to mention this first though because it's very important (and will save you a ton of repetition) to set up Prowlarr first to manage your indexers: https://github.com/Prowlarr/Prowlarr.
Lidarr (Music): https://github.com/Lidarr/Lidarr Lidarr can also pull down new album releases for artists, but that's something I usually have turned off (the artists I love I buy the CD for anyway).
Sonarr (TV): https://github.com/Sonarr/Sonarr The cool thing about Sonarr is that it pulls down new episodes automatically for TV Shows. This was the OG and what most things forked off of.
Radarr (Movies): https://github.com/Radarr/Radarr
Bazarr (Subtitles): https://github.com/morpheus65535/bazarr Bazarr connects to Radarr and Sonarr and supplies subtitles in whatever language
For discovery I'd suggest using https://www.last.fm/ and/or https://listenbrainz.org/ (I use both)