Toolkit for working with and mapping geospatial data
Viking is a free/open source program to manage GPS data
Simple GPS tracking server
Plugins for OpenCPN
This is a port of LibRTK on C#, and into a small c/c++ library.
OTB is an open-source C++ library for remote sensing images processing
LGPL GML parser
Open Street Map (OSM) tools, OSM/XML parser, tag extractor
Tile Cache Server