OpenStreetMap
OSM Homepage: http://www.openstreetmap.org/
Import
- GRASS_AddOns#v.in.osm (fairly rough script)
Conversion with Mapnik to raster tiles may work, but be very careful about projection issues, typical online web map tiles are not appropriate for GIS import.
Data as shapefiles
Get data from here:
Then import with v.in.ogr
Data from WMS
- Web Map Service (WMS) for Europe: GetCapabilities to access the WMS
- No free/open world-wide server known - Badly needed
Then import with r.in.wms