Viking is a free/open source program to manage GPS data
Little spatial viewer for geometries like SDO geometries, WKT and EWKT
utilities for cadastre system
Analysis and display of Census, business, government attribute data
Show your position live on the web using your phone as a tracker
a space-time interpolation geostatistical tool
FastVersion is a Qgis plugin for data versioning in a Postgis database
Application to browse and visualize your GPS files
QNetMap is the library for displaying the map and the objects on it