Viking is a free/open source program to manage GPS data (inc GPX, FIT, TCX and KML files). You can import and plot tracks, routes and waypoints, show OpenStreetMaps (OSM), Bing Aerial and other maps, generate Mapnik maps, geotag images, make new tracks, routes and waypoints, see real-time GPS position, etc. It is written mostly in C with GTK

very simple gpx/kml file loader library

A GPS Forensics Utility to Parse GPX Files

Query and export KML files from ANFR radio sites public data

A command line utility to merge multiple paths (or poly-lines) in a KML file, producing a new KML file with a single path.

Viking is a free/open source program to manage GPS data (including GPX, TCX + KML files). You can import and plot tracks, routes and waypoints, show OpenStreetMaps (OSM), Bing Aerial and other maps, generate Mapnik maps, geotag images, make new tracks, routes and waypoints, see real-time GPS position, etc. It is written mostly in C with GTK+ 3