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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.
Harbour (Docker containers monitoring, requires portainer though)
Swiftin (Official modern jellyfin client written in Swift since the current jellyfin app is basically a wrapped web app)
For PWA, I use Overseerr which is not bad but could be better IMo as a native app and there's also iQbit which is a iOS styled web theme for qbittorrent and you can run it as a separated service/container so you can have the normal webUI on desktop and this iOS style theme for your phone as a PWA.
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.