Traccar GPS Tracking System
Build your own GPS unit
Open source system for GPS tracking devices
Plugins for OpenCPN
CAD 2D for Land Surveying and Civil
This is a port of LibRTK on C#, and into a small c/c++ library.
Toolbox for geoscientists and geo enthusiasts
CAD 2D for Land Surveying,Civil and more
GT2 combines online and offline navigation for hikers and cyclists
Convert GPS-Tracks user-saved tracks to KML files for Google Earth.
GPSBabel converts and transfers data like waypoints, tracks & routes.