Viking is a free/open source program to manage GPS data
GPS log file viewer and analyzer
Toolkit for working with and mapping geospatial data
GPS track editor for editing tracks and planning (multiple) day tours
Geographic feature extraction and data mining
A Matlab software to estimate Euler pole parameters
A software package for quantitative analysis in Panbiogeography
A project on topography and weather comparison
Open source cross-platform Java Visual Traceroute
NMEA 0183 library for Java
Tool to work on map data, to check the data and generate your own maps
Offline vector map display ported from OsmAnd
Sight Reduction for Air Navigation with Python
Geodesy based library (geodetic and geocentric functions)