Build your own GPS unit
GPS track editor for editing tracks and planning (multiple) day tours
Viking is a free/open source program to manage GPS data
Open source system for GPS tracking devices
Minimalistic wide-open GPS-locator/tracker
NMEA 0183 library for Java
A library to generate short codes
CAD 2D for Land Surveying and Civil
Scientific research work of Francesco Montorsi,Univ. of Modena, Italy
CAD 2D for Land Surveying,Civil and more
GT2 combines online and offline navigation for hikers and cyclists
Visualize data from the opencellid.org project