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 interactive tool for GNSS position time series analysis
Tool to work on map data, to check the data and generate your own maps
Plugins for OpenCPN
A software gps simulator
A reference implementation of the Polish geobotanical grid
CAD 2D for Land Surveying and Civil
Batch convert Lat/Long to UTM for Zone 19
Multiplatform Ham Radio APRS and Mapping Program
Land survey field crew data management for .RAW and .JOB file types.
Toolbox for geoscientists and geo enthusiasts
Track your mobile device or cellphone via internet using OpenGTS/GPRMC