Gpx To Csv
here is video on how to convert Gpx To Csv
If you want to automate conversion or avoid user Interface (UI) and run "Gpx To Csv" application from command line - here is an example of how to do it:
"C:\Program Files (x86)\WhiterockSoftware\GpxToCsv\GpxToCsv.exe" inputfile.gpx outputfile.csv