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Geo::Gpx
Geo::Gpx is a Perl module to create and parse GPX files....
GPX Viewer
A simple tool to visualize tracks and waypoints stored in a gpx file...
Geocaching.com GPX Downloader
With this add-on for Firefox you will be able to grab geocache info in GPX format...
gpxtools
Command-line tools useful to manipulate GPX files...
Python library Python handler command-line tools GPX handler
CM2GPX
CM2GPX project is used to convert EasyGPS XML file formats (LOC and GPX) to a format that can be installed onto a Palm OS....
GPXrenderer
A processing app to visualise your GPX tracks...