This is a List of the unofficial Plugins for MythTV. These are not included within the official release . They probably will not work with the newest MythTV Versions, because they are developed for older ones.
MythMail  - A POP3 Client for the Mythfrontend
MythReciepe  - Reciepies for your TV Computer in the kitchen
MythKaraoke  - Listen to Music and sing it.
MythFM  - Listen to Radio.
MythStream  - Playing of Audio and Videos Streams in MythTV
MythCalendar  - A calendaring system for MythTV
MythTiVo  - A GUI Front End to allow selection of Now Showing Items from any IP connected TiVo. (for MythTV 0.11)
MythChannels  - A Plugin to Configure the Channels (fro MythTV 0.15)
MythStreamTV  - Live Transcoding and Streaming of MythRecordings over the Network.
TVWish  - Generate/grab a list of the hundreds of top movies you wish to see someday, and arrange for them to be recorded if they are ever on TV. Instead of browsing what movies are on in the next 2 weeks, just pick all your movies at once, and eventually they'll show up. Look for and record the pilot episodes of hundreds of the top TV series of all time, in case you missed them, or want to try them out. And a lot more....
MythHelper  - MythHelper is a Windows application which has been created to aid in the process of transcoding recordings from a MythTV machine. Currently MythHelper will aid in rancoding to both XVID AVI and DVD MPEG2 files.
DsMyth  - A collection of DirectShow filters and applications that enables playback of MythTV .nuv files on windows. The idea is to allow almost any mediaplayer to handle mythtv nuv files including streaming files from the backend and wathching livetv.
WinMyth  - A Windows Frontend for MythTV
Sasquatch Photo 
Abstract  (offline??)MythTV Media Center 
OneMythTheme Project Grayhem theme  
Myxer