The Unofficial XCSoar Manual

From XCSoar

How to playback your IGC files

You can also convert IGC files to KML files with the following tools:

http://ywtw.de/igc.html (I have never tried this one) http://www.gpsbabel.org/ (this is the one I use - but sometimes you have to make minor mods to your text file)

Once you do you can then watch your IGC files in 3d on Windows, Linux or Mac using Google Earth

http://earth.google.com/

There are also a range of free and commercial tools available here: Tools