Geographic library
GPS log file viewer and analyzer
Viking is a free/open source program to manage GPS data
Toolkit for working with and mapping geospatial data
A software package for quantitative analysis in Panbiogeography
Tool to work on map data, to check the data and generate your own maps
Plugins for OpenCPN
Sight Reduction for Air Navigation with Python
Geodesy based library (geodetic and geocentric functions)
GPS mapping and management software
FastVersion is a Qgis plugin for data versioning in a Postgis database
A map maker via online map services
Multiplatform Ham Radio APRS and Mapping Program