Minimalist POI Map Tracker and Trip Planner
Viking is a free/open source program to manage GPS data
GPS track editor for editing tracks and planning (multiple) day tours
Plugins for OpenCPN
Sight Reduction for Air Navigation with Python
FastVersion is a Qgis plugin for data versioning in a Postgis database
NMEA libary for java (protocol of GPS devices)
Create cartographic map frames from an XML template
Open Street Map (OSM) tools, OSM/XML parser, tag extractor
Visualize data from the opencellid.org project
functions for working with geographical data in lisp