Viking is a free/open source program to manage GPS data
Open source system for GPS tracking devices
GPS log file viewer and analyzer
GPS track editor for editing tracks and planning (multiple) day tours
Earth orbits and satellite coverage display in 3D on your laptop.
A Matlab software to estimate Euler pole parameters
NMEA 0183 library for Java
Mala ProEx and Easy Locator GPR control software
Tool to work on map data, to check the data and generate your own maps
Plugins for OpenCPN
Simple GPS tracking server
A software gps simulator
C API to control NexStar compatible telescopes
GPS mapping and management software
CAD 2D for Land Surveying and Civil