GPS log file viewer and analyzer
Open source cross-platform Java Visual Traceroute
Toolkit for working with and mapping geospatial data
Bootable linux distro for Geospatial Applications
... the open-source glide computer
Tool to work on map data, to check the data and generate your own maps
GPS mapping and management software
http://abc-map.fr
Multiplatform Ham Radio APRS and Mapping Program
Former project page
OTB is an open-source C++ library for remote sensing images processing
Some pythons plugins to enhance fantasy maps creation with QGis
Software for distance cartogram creation