Build your own GPS unit
Open source system for GPS tracking devices
NMEA 0183 library for Java
A library to generate short codes
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
Convert a Garmin ADM database file to a GPX file
GPSBabel converts and transfers data like waypoints, tracks & routes.