Unpackerr runs as a daemon on your download host. It checks for completed downloads and extracts them so Radarr, Lidarr, Sonarr, and Readarr may import them. There are a handful of options out there for extracting and deleting files after your client downloads them. I just didn't care for any of them, so I wrote my own. I wanted a small single-binary with reasonable logging that can extract downloaded archives and clean up the mess after they've been imported.