Blender addons to make the bridge between Blender and geographic data
Cross platform (lin/win/mac) geographical information system (GIS)
Interactive, thoroughly customizable maps in the browser
Viking is a free/open source program to manage GPS data
Toolkit for working with and mapping geospatial data
GPS track editor for editing tracks and planning (multiple) day tours
Plugins for OpenCPN
A small nifty program where you build you own ZOO
Show your position live on the web using your phone as a tracker
FastVersion is a Qgis plugin for data versioning in a Postgis database
OpenSeaMap Depth Contours
Java Swing component for integrating OSM maps into your Java app.
Toolbox for geoscientists and geo enthusiasts
Track your mobile device or cellphone via internet using OpenGTS/GPRMC
Source code for ArcGIS Viewer for Flex - a great application framework
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.