Viking is a free/open source program to manage GPS data
... the open-source glide computer
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
Scientific research work of Francesco Montorsi,Univ. of Modena, Italy
GPS tracker for J2ME phones