Viking is a free/open source program to manage GPS data
Create, edit view GPX tracks (in the background - online maps)
Plugins for OpenCPN
GPS mapping and management software
Open Source Marine Chart Plotting Program
This is a port of LibRTK on C#, and into a small c/c++ library.
Analyze and change GPS coordinates and time in digital pictures
Land survey field crew data management for .RAW and .JOB file types.
A software to manipulate RINEX 3 files
Plugin for OpenCPN
A program to convert different GPS date formats.
Analyze gpx files and store summary in Sqlite database
GPS data in a file for development testing