Geographic library
Toolkit for working with and mapping geospatial data
Viking is a free/open source program to manage GPS data
GPS track editor for editing tracks and planning (multiple) day tours
Open source system for GPS tracking devices
An information system for cyclists in Berlin and Brandenburg
Set of Java interfaces for geospatial applications
Tool for assessment of environmental services on farm scale.
A software package for quantitative analysis in Panbiogeography
A project on topography and weather comparison
Tool to work on map data, to check the data and generate your own maps
A GUI for the freeware Geographical Information System PCRaster
Offline vector map display ported from OsmAnd
Plugins for OpenCPN
Geodesy based library (geodetic and geocentric functions)