Radarr is an independent fork of Sonarr reworked for automatically downloading movies via Usenet and BitTorrent. The project was inspired by other Usenet/BitTorrent movie downloaders such as CouchPotato.

Prowlarr is a indexer manager/proxy built on the popular arr .net/reactjs base stack to integrate with your various PVR apps. Prowlarr supports both Torrent Trackers and Usenet Indexers. It integrates seamlessly with Sonarr, Radarr, Lidarr, and Readarr offering complete management of your indexers with no per app Indexer setup required (we do it all).