XYZ Tiles

OpenStreetMap
http://tile.openstreetmap.org/{z}/{x}/{y}.png

Google Hybrid
https://mt1.google.com/vt/lyrs=y&x={x}&y={y}&z={z}

Google Satellite
https://mt1.google.com/vt/lyrs=s&x={x}&y={y}&z={z}

Google Road
https://mt1.google.com/vt/lyrs=m&x={x}&y={y}&z={z}

Bing Aerial
http://ecn.t3.tiles.virtualearth.net/tiles/a{q}.jpeg?g=1