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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.
For YouTube downloading of playlists and channels, along with payback theres TubeArchivist
Music aquiring theres Headphone - (needs configuration of provider and a downloader)
Web caching (more techical, probably not useful) there squid-cache
TV shows aquiring theres Sonarr - (has to tie into a indexer and a downloader)
Movie aquiring theres Radarr (has to tie into a indexer and a downloader)
Playback theres Jellyfin
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.