Viking is a free/open source program to manage GPS data
Toolkit for working with and mapping geospatial data
Open Source Desktop GIS with Surveying and Cartography Functionality
GoogleEarth Organiser, Editor & Toolkit
GT2 combines online and offline navigation for hikers and cyclists
Processes, decodes, displays, records and replays EUROCONTROL ASTERIX
Convert GPS-Tracks user-saved tracks to KML files for Google Earth.