SickRage - SickRage is a fork of SickBeard to automatically download TV shows from usenet or torrents.
Sonarr - Sonarr (formerly NzbDrone) is a PVR for Usenet and BitTorrent users.
FlexGet - FlexGet is a multipurpose automation tool for all of your media
Radarr - A fork of Sonarr designed to work with Movies.
Nefarious - nefarious is a web application that automatically downloads Movies and TV Shows.
Sick Beard - Sick Beard is a PVR for newsgroup users (with limited torrent support).