Viking is a free/open source program to manage GPS data
Toolkit for working with and mapping geospatial data
An information system for cyclists in Berlin and Brandenburg
GPS track editor for editing tracks and planning (multiple) day tours
A software package for quantitative analysis in Panbiogeography
Geographic feature extraction and data mining
Open source system for GPS tracking devices
Tool to work on map data, to check the data and generate your own maps
A GUI for the freeware Geographical Information System PCRaster
Plugins for OpenCPN
A software gps simulator
a space-time interpolation geostatistical tool
Multiplatform Ham Radio APRS and Mapping Program
Land survey field crew data management for .RAW and .JOB file types.