Viking GPS data editor and analyzer

Viking is a free/open source program to manage GPS data. You can import, plot and create tracks, routes and waypoints, show OSM, Bing Aerial and other maps, geotag images, create routes using OSRM, see real-time GPS position (not in Windows), make maps using Mapnik (not in Windows), control items, etc.

It is written in mostly in C (with some C++) & the GTK+3 toolkit.

Viking is currently dual managed - with a corresponding Github presence at:

https://github.com/viking-gps/viking

Where you may find it easier to view the code and raise issues there too.