GPS Track Editor is a Windows application to do everything with GPS tracks. With it you can: analyze and clean up your GPS tracks, make a clear structure of track segments, view your trajectory in color, inspect track points, extract parts of a track, save as GPX, NMEA, or CSV file, merge several tracks into one, generate timestamps.
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Garmin Basecamp is free and does everything....tracks, markers, routes, conversion etc, etc
and you can us any one of a number of maptiles, I use thunderforest and OSM Outdoors.