Cross platform (lin/win/mac) geographical information system (GIS)
GPS navigation software for Windows Mobile & WinCE devices.
French Geographic Information System
Automated detection of the unknown early map projection
A GUI for the freeware Geographical Information System PCRaster
Plugins for OpenCPN
Geodesy based library (geodetic and geocentric functions)
A free library for fast clipping of arbitrary polygons
GPSBabel converts and transfers data like waypoints, tracks & routes.