Geographic library
Viking is a free/open source program to manage GPS data
GPS log file viewer and analyzer
An information system for cyclists in Berlin and Brandenburg
Toolkit for working with and mapping geospatial data
Geographic feature extraction and data mining
Simple GPS tracking server
Open source system for GPS tracking devices
NMEA 0183 library for Java
Adjustment of local surveying networks, binary builds for Windows
A GUI for the freeware Geographical Information System PCRaster
Plugins for OpenCPN
Geodesy based library (geodetic and geocentric functions)
Library for OpenStreetMap offline rendering and routing
GPS mapping and management software
Subway maps of the World !
Open Source Marine Chart Plotting Program