GPS log file viewer and analyzer
Viking is a free/open source program to manage GPS data
Open source system for GPS tracking devices
NMEA 0183 library for Java
eGPXviewer is a 3D GPX track viewer
A library to generate short codes
A tile-based map viewer with support for GPX files.
Scientific research work of Francesco Montorsi,Univ. of Modena, Italy
FAA digital chart viewer for iPhone and iPad