"SickBeard now has a daemon mode.  To start in daemon mode type the following in a Terminal window: python sickbeard.py -d
You can close the Terminal window and it will continue to run."

"The ultimate PVR application that downloads and manages your TV shows
Automatically finds new and old episodes for you and it works with your current download client!"

"CouchPotato is an automatic NZB and torrent downloader. You can keep a "movies I want"-list and it will search for NZBs/torrents of these movies every X hours. Once a movie is found, it will send it to SABnzbd or download the .nzb or .torrent to a specified directory."