Accurately Locate Smartphones using Social Engineering
Build your own GPS unit
Simple GPS tracking server
Minimalistic wide-open GPS-locator/tracker
eGPXviewer is a 3D GPX track viewer
This is a port of LibRTK on C#, and into a small c/c++ library.
A software to manipulate RINEX 3 files
compeo++ - Manage Flytec/ Bräuniger Instruments
GPSBabel converts and transfers data like waypoints, tracks & routes.