OSGeo Tile Map Service
An OSGeo Tile Map Service provides access to resources in particular to rendered or pre-rendered/cached cartographic tiles at fixed scales over the internet.
Note: The OSGeo Tile Map Service specification is under active development, and is subject to change.
Select Home > Add Overlay > Web > OSGeo Tile Map Service and click Finish.
Select from the list of Tile Map Servers that are displayed.