Viking is a free/open source program to manage GPS data
An information system for cyclists in Berlin and Brandenburg
... the open-source glide computer
Plugins for OpenCPN
Geodesy based library (geodetic and geocentric functions)
CAD 2D for Land Surveying and Civil
A map maker via online map services
Satellite Emulator
CAD 2D for Land Surveying,Civil and more
Plugin for OpenCPN
a free and open map of wireless communicating objects