GPS log file viewer and analyzer
Viking is a free/open source program to manage GPS data
Build your own GPS unit
Minimalistic wide-open GPS-locator/tracker
Plugins for OpenCPN
A C library for parsing/normalizing street addresses around the world
A library to generate short codes
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
NMEA libary for java (protocol of GPS devices)
Whitestone Interactive GPS Software for .Net
Shortest Path Navigator with Directions and Distance
A software to manipulate RINEX 3 files
Plugin for OpenCPN
a free and open map of wireless communicating objects
GPS data in a file for development testing
PC/PocketPC tool to get tracklogs from the WBT-201 GPS logger