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Moonfin
A TV-style Jellyfin client with a much nicer interface than Jellyfin's own, the app used for actually watching everything.
Moonfin is a community-built front end for Jellyfin, made specifically for TVs, Chromecast, and the web, with a slicker, more Netflix-like browsing experience than Jellyfin's stock apps.
It's not a separate media server; it connects to the same Jellyfin server described in its own guide entry, just through a considerably nicer window into it.