MediaPortal (Windows) is free open source media center PC application.

MediaPortal turns your PC and TV into a very advanced home media center. The software allows you to listen to your favorite music and radio stations; watch and store your videos and DVDs; view, schedule (electronic program guide available) and record live TV as a digital video recorder; view local weather; and much, much more.

MediaPortal features much of the functionality of a regular Media Center, but as an open source project, it is a lot more customizable than the regular Windows MCE and you can tweak it for your own needs with lots of innovative plug-ins from a large community.

TV Features:

• Supports analog TV, DVB-C, DVB-T, DVB-S and ATSC
• HDTV and AC3 support
• Support for multiple tuners
• Record, watch, and timeshift Live TV
• Advanced recording scheduler:
  - Record once
  - Record now
  - Daily o Weekly
  - Weekdays (Mon-Fri)
  - Every time a program appears on this TV channel
• Timeshifting,Watch, Pause, Rewind, FF, RW Live TV
• Advanced recording management:
  - Handle conflicts
  - Set recording priorities
  - Quality settings / recording
  - Transcode to WMD, XVID or MPG
  - Diskmanagement auto deletes old and/or watched recordings
  TVGuide:
  - Grab DVB-EPG & MHW-EPG directly for DVB
  - Supports XMLTV
  - Colors for genres
• TV Guide search
• TV Channel grouping
• Supports over > 10000 channels
• Auto channel tuning
• Normal OSD (On Screen Display during movies/tv)
• Special ZAP OSD (Shows description of what is playing currently on TV)
• Support for Teletext
• Standby control to put your HTPC sleeping. It will awake when there a recording needs to start