OpenStreetMap http://a.tile.openstreetmap.org/{z}/{x}/{y}.png
OpenStreetMap Mapnick http://tile.openstreetmap.org/{z}/{x}/{y}.png
OSM Cycle Map http://tile.thunderforest.com/cycle/{z}/{x}/{y}.png
OSM Black and White http://tiles.wmflabs.org/bw-mapnik/{z}/{x}/{y}.png
Esri Imagery/Satellite https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}
Esri Streets https://server.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer/tile/{z}/{y}/{x}
Esri Topo https://server.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer/tile/{z}/{y}/{x}
Google Maps http://mt0.google.com/vt/lyrs=m&hl=en&x=%7Bx%7D&y=%7By%7D&z=%7Bz%7D
Google Maps https://mt1.google.com/vt/lyrs=r&x={x}&y={y}&z={z}
Google Earth http://mt0.google.com/vt/lyrs=y&hl=en&x=%7Bx%7D&y=%7By%7D&z=%7Bz%7D&s=Ga
Google Satellite https://mt1.google.com/vt/lyrs=s&x={x}&y={y}&z={z}
Google Earth http://mt0.google.com/vt/lyrs=y&hl=en&x=%7Bx%7D&y=%7By%7D&z=%7Bz%7D&s=Ga
Google Satellite https://mt1.google.com/vt/lyrs=s&x={x}&y={y}&z={z}
Google Satellite http://www.google.cn/maps/vt?lyrs=s@189&gl=cn&x={x}&y={y}&z={z}
Google Satellite Hybrid https://mt1.google.com/vt/lyrs=y&x={x}&y={y}&z={z}
Google Terrain https://mt1.google.com/vt/lyrs=t&x={x}&y={y}&z={z}
Google Roads https://mt1.google.com/vt/lyrs=h&x={x}&y={y}&z={z}
Google Streets https://mt1.google.com/vt/lyrs=m&x={x}&y={y}&z={z}
Carto Positron https://cartodb-basemaps-a.global.ssl.fastly.net/light_all/{z}/{x}/{y}.png
Stamen Terrain http://a.tile.stamen.com/terrain/{z}/{x}/{y}.png