OakGPS

GPS and sensor analysis tools by Åke Wallebom

Free!

TrackView.NET - Analyze a run on a race track. When did I brake? What entry speed did I have in the chicane? How fast did I go on the straight? etc.
Requires .NET Framework 2.0

OakLogMobile - Logger that records GPS and sensor information on your phone
Works on Windows Mobile 5.0+ (or beta-test it for Android 1.5+)

TrackView.NET Screenshots