Cross platform (lin/win/mac) geographical information system (GIS)
Blender addons to make the bridge between Blender and geographic data
Python data, Leaflet.js maps
Minimalist POI Map Tracker and Trip Planner
Interactive, thoroughly customizable maps in the browser
Viking is a free/open source program to manage GPS data
GPS track editor for editing tracks and planning (multiple) day tours
Create, edit view GPX tracks (in the background - online maps)
Plugins for OpenCPN
Sight Reduction for Air Navigation with Python
A small nifty program where you build you own ZOO
HexWorld a hexagon map example with code
A library to generate short codes
FastVersion is a Qgis plugin for data versioning in a Postgis database
OpenSeaMap Depth Contours
Map Extracts From OSM
Analyze and change GPS coordinates and time in digital pictures
Toolbox for geoscientists and geo enthusiasts
NMEA libary for java (protocol of GPS devices)
Source code for ArcGIS Viewer for Flex - a great application framework
Create cartographic map frames from an XML template
Open Street Map (OSM) tools, OSM/XML parser, tag extractor
Customization of OpenGTS look and feel
Interactive OpenGL map projection and navigation with geodetic utils.