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.
http://mythextra.napsi.net/ - Plugins: MythMail (A POP3 Client), MythReciepe (Reciepies for your TV Computer in the kitchen), MythKaraoke (as the Name sais), MythFM (Listen to Radio)
http://mythstreamtv.sourceforge.net/ - MythStreamTV - Live Transcoding and Streaming of MythRecordings over the Network.
http://home.kabelfoon.nl/~moongies/streamtuned.html - MythStream - Playing of Audio and Videos Streams in MythTV
http://www.knoppmythwiki.org/index.php?page=MythTVBurn_Scripts_HowTo - MythBurn - A extension to MythWeb, so that you can burn your Recordings on CD/DVD.
http://www.wombatinvasion.com/pmwiki/pmwiki.php/MythTV/MythCalendar - MythCalendar - A calendaring system for MythTV