PMM (Plex Meta Manager)

https://metamanager.wiki/en/latest/

Plex Meta Manager is an open source Python 3 project that has been designed to ease the creation and maintenance of metadata, collections, and playlists within a Plex Media Server. The script is designed to be run continuously and be able to update information based on sources outside your plex environment. Plex Meta Manager supports Movie/TV/Music libraries and Playlists.