GPS log file viewer and analyzer
Viking is a free/open source program to manage GPS data
Transport coordinate between earth(WGS-84) and mars in china(GCJ-02)
Build your own GPS unit
Simple GPS tracking server
Minimalistic wide-open GPS-locator/tracker
Plugins for OpenCPN
A C library for parsing/normalizing street addresses around the world
A reference implementation of the Polish geobotanical grid
GPS mapping and management software
Open Source Marine Chart Plotting Program
This is a port of LibRTK on C#, and into a small c/c++ library.
Satellite Emulator
A tile-based map viewer with support for GPX files.
Toolbox for geoscientists and geo enthusiasts
A software to manipulate RINEX 3 files
A gui for linux users of miniHomer, a GPS tracker
FAA digital chart viewer for iPhone and iPad
A library for Ublox serial message parsing
Aircraft navigator with HSI for TomTom devices
Visualize data from the opencellid.org project
Plugin for OpenCPN