KFLog is an OpenSource program aiming at glider pilots. It gives you a powerful tool to plan your flight tasks before you go flying, and analyse your flights afterwards.
KFLog is the only flight analyser program available for Linux to be recognised by the FAI IGC.
KFLog projects the flight on a digital vector map, that contains not only airfields and airspaces, but a complete elevation-map, roads cities, rivers, and lots of other interesting objects.
Take a look at the screenshots to get a first impression of KFLog.