Sonarr for TV shows Radarr for Movies Lidarr for Music others for books etc.

These can be hooked up to Usenet indexers which search the usenet for the shows/films/etc you are after.

They then pass the info to SABNZBD or NZBGet (other options available) which you hook up to a Usenet provider to actually download the files.

Indexers have free options, but paid are better, and providers are always paid iirc.