Viking is a free/open source program to manage GPS data
Toolkit for working with and mapping geospatial data
Tool to work on map data, to check the data and generate your own maps
Offline vector map display ported from OsmAnd
Geodesy based library (geodetic and geocentric functions)
GPS mapping and management software
Application for managing land searches for missing persons.
Web Mapping Platform
Multiplatform Ham Radio APRS and Mapping Program
A wildfire decision support system and visualization tool from Emxsys.
A gui for linux users of miniHomer, a GPS tracker
Tile Cache Server