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QNetMap is the library for displaying the map and the objects on it
The project has moved to GitHub (see https://github.com/vasyutin/qnetmap).
The project is based on the QMapControl library (http://qmapcontrol.sourceforge.net/) by Kai Winter.
To show the map QNetMap can use different providers like OpenStreetMap or other WMS servers. The map data can be downloaded from the Internet or from the disk cache.
User's own raster maps can also be used.
QNetMap supports layers so you can mix maps from different servers.