OSM Mapnik
OSM OpenMapSurfer
GIScene.js example - DEM SRTM-30m (simplified) with XYZ raster tile overlay switcher
Data Sources:
Terrain: SRTM-1 data available from the U.S. Geological Survey.
Map overlays:
OpenStreetMap Mapnik © by OSM conttibutors. Available at
http://www.openstreetmap.org/
OpenMapSurfer Roads. © by OSM conttibutors. Available at
http://korona.geog.uni-heidelberg.de/