Otomatic!

Sonarr (formerly NzbDrone) is a PVR for Usenet and BitTorrent users. It can monitor multiple RSS feeds for new episodes of your favorite shows and will grab, sorts and renames them. It can also be configured to automatically upgrade the quality of files already downloaded when a better quality format becomes available.

Flexget is a small program that will collect the torrents for TV shows and download new episodes for you automatically.

Sick Beard is a PVR for newsgroup users (with limited torrent support). It watches for new episodes of your favorite shows and when they are posted it downloads them, sorts and renames them, and optionally generates metadata for them. It currently supports NZBs.org, NZBMatrix, NZBs'R'Us, Newzbin, Womble's Index, NZB.su, TVTorrents and EZRSS and retrieves show information from theTVDB.com and TVRage.com.

Novaroma is free open source software. You can search and download tv shows, movies and subtitles automatically. Also you can use Novaroma with dlna media servers (XMBC, Plex, Servio, PS3 etc.)

MyTvShowsOrganizer is an open source app that downloads torrents of TV episodes.It has all the tools to organize, download and get info about TV shows.

DSeries is a TV Series/Shows Downloader (almost) for all operating systems. It should run on any system that has java installed :)

Episode Butler is a tool to automatically fetch new episodes of your favorite shows from usenet. It remembers which episodes you already downloaded and monitors newzbin, nzbmatrix and/or nzbs.org to see if a new one is available. It also knows when new episodes are aired and tries to download these when they are available. New episodes are passed to your favorite newsgrabbing tool so it can be downloaded from the newsgroup its posted in without any user interaction.

TorrentGrabber - check for your new TV show episodes and get them loaded to your Torrent Application automatically.. and get notified when they arrive!