Lazy Librarian

Ombi is a self-hosted web application that automatically gives your shared Plex or Emby users the ability to request content

NZBHydra 2 is a meta search for newznab indexers and torznab trackers. It provides easy access to newznab indexers and many torznab trackers via Jackett. You can search all your indexers and trackers from one place and use it as an indexer source for tools like Sonarr, Radarr, Lidarr, etc