Traccar GPS Tracking System
Viking is a free/open source program to manage GPS data
Open source system for GPS tracking devices
Simple GPS tracking server
Minimalistic wide-open GPS-locator/tracker
NMEA 0183 library for Java
A library to generate short codes
Track your mobile device or cellphone via internet using OpenGTS/GPRMC
See you and your friends on a map
Scientific research work of Francesco Montorsi,Univ. of Modena, Italy