Viking is a free/open source program to manage GPS data
Build your own GPS unit
Open source system for GPS tracking devices
NMEA 0183 library for Java
A library to generate short codes
CAD 2D for Land Surveying and Civil
Application to browse and visualize your GPS files
A software to manipulate RINEX 3 files
Using PHP-CLI to parse NMEA data to generate depth maps with GD
Scientific research work of Francesco Montorsi,Univ. of Modena, Italy
CAD 2D for Land Surveying,Civil and more
Convert a Garmin ADM database file to a GPX file
GPSBabel converts and transfers data like waypoints, tracks & routes.