C_GPS2KML can convert GPS log files into KML/KMZ files that can can be opened in Google Earth.
The program is not a simple converter, but has many additional features and options.
It can handle many objectes : points, traces, arrows and waypoints. For each it’s possible to define parameters as color, width, dimension and so on.
It’s also possible to create graphs using the logged data. Many graphs are available as Altitude,Speed, Acceleration and many others.

Last but not least it’s possible to georeference you picture and view in Google Earth where you shot them.
Here are some examples of KMZ files for Google Earth generated using C_GPS2KML:

Download Page:
User Manual:

Here are some snapshots of KML files generated using C_GPS2KML features.

Example of interactive plot with Speed and Altitude (click to enlage)
Example of detailed track with Altitude plot (click to enlage)
Example of detailed track with N of satellites used plot (click to enlage)
Example of track coloured by parameters (Speed or Altitude) - click to enlarge

Example of track with georeferenced pictures (click to enlarge)

Example of detailed track with Speed plot (click to enlage) 

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