Program viewers

gShowTV : A TV program schedule viewer and a Personal Video Recorder GUI
OnTV : GNOME Applet for monitoring current and upcoming TV programs.
skXMLTV : Superkaramba XML TV Viewer (for Lunix/KDE)
XSLTv : Browser-based viewer for XMLTV listings.
TV-Browser : Java application to display personalized TV/Radio program listings (can use a converter to read XMLTV style files)
FreeGuide TV Guide : Java-based application to display personalised TV program listings, uses native XMLTV support.
StoryTV : .NET application to create a personalized TV-guide every week based on your preferences.
Yabby TV Guide : A light-weight program for XMLTV listings. In alpha testing as of June 2007.
nxtvepg : EPG with TeleTEXT data source that also can read XMLTV files

PVR and Media centers

Freevo : An open-source home theatre PC platform based on Linux
MythTV : A powerful Personal Video Recorder for Linux
SageTV : Commercial PVR and media center for Windows.
Showshifter : Commercial PVR and media center for Windows (now defunct).
Meedio : Commercial media center for Windows (now defunct, sold to Yahoo!).
MediaPortal : Open-Source Media Center
Beyond TV : Commercial PVR for Windows
GB-PVR : free (but not open-source) PVR for Windows
DVB Web Sheduler : open source PVR for Windows written in java
DScaler : An ongoing attempt to get the best video quality possible from a Windows PC

xmltv-druid : a very simple Gnome druid for selecting, configuring and scheduling a tv_grab task for XMLTV.
TVXB : Another program extractor (Windows and Wine).
XMLTV Producer for PHP : Framework to write XMLTV grabbers in PHP.