GPX Viewer is a simple program to visualize a GPX file. It uses libchamplain and cairo for the plot. It can show multiple GPX files, show waypoints and multiple tracks per GPX file, highlight a selected track, show a speed vs. time graph, and show distance, duration, average, moving average, max speed, moving time, and GPS points. It supports zooming, smoothing of the speed graph, and highlighting points in a speed graph on a map.
LocDemo demonstrates the functionality of libwlocate. After startup, it evaluates the current geographic position of the user and displays it within a map. This solution offers geographic localization that works without the use of GPS and without submitting tracking or position data to commercial providers of such services.
fastgps is a fully functional GPS software receiver which demonstrates all the steps performed in a GNSS navigation receiver. This receiver includes: an FFT acquisition; code and carrier tracking; pseudorange measurements; navigation data decoding; and position, velocity, and time estimation functions. The software receiver is also capable of using external aiding data from the International GNSS Service (IGS) as well as applying WAAS differential ionosphere corrections.