You should look in to Usenet + Indexers + Sonarr + Plex.

There are quite a few different guides on the subject. Basically, you would use Usenet as the backend source. Sonarr would be the application to grab all the files and automate downloading. Plex would be used for sharing. It's a whole rabbit hole.

Not sure if you're familiar with the terminology but WordPress is a Content Management System (CMS). I honestly don't know of many other than WordPress, I've heard of Joomla and Drupal but can't speak to anything about them other than they're CMSs, they're FOSS, and I've heard them talked about.