Viking is a free/open source program to manage GPS data
Simple GPS tracking server
Analysis and display of Census, business, government attribute data
Multiagent simulator of road traffic in Qt/C++ and OpenStreetMap.
This is a port of LibRTK on C#, and into a small c/c++ library.
Open Street Map (OSM) tools, OSM/XML parser, tag extractor
Aircraft navigator with HSI for TomTom devices
Python-accessible toolkit for Geoscience & Remote Sensing Applications