A GPS bicycle speedometer that supports offline maps and track recording

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

Open source bike GPS: with Strava segments !

C program to match GPS tracks to photographs, and store the matches in the EXIF data in the photographs.

An utility to create Openstreetmap slippy map tiles from a set of GPX files.

GPS track visualizer

Utitily to minify gpx files by removing redundant information

very simple gpx/kml file loader library

Application for extracting GPX data from GoPro MP4 files

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

Web app to display GPX data from GPX files uploaded to a server

A portable data downloading and configuration utility for classic MTK GPS Loggers runs on M5Stack Basic.