cadmapper.com
Cadmapper creates 3D CAD files of any area in the world from public data sources such as OpenStreetMap, NASA and USGS, producing organized, layered drawing files. Areas up to 1 km2 are free, files up to 100 km2 cost a small fee, and whole-city road network DXF files are free. It targets designers, architects and illustrators, with support for AutoCAD and SketchUp.