Bing road & satellite & hybrid (zoom 1..18)
Esri National Geographic (zoom 0..12)
Esri Reference/World Transportation (zoom 0..18)
Esri Soil Survey (North America, zoom 0..16)
Esri Navigation Charts (parts of the world, zoom 0..10)
Esri World Imagery (zoom 0..17)
Esri Physical (zoom 0..8)
Esri World Street Map (zoom 0..18)
Esri World Topo Map (zoom 0..18)
Geocommons Acetate (zoom 2..18)
Google high-res road & terrain (zoom 0..18)
Google hybrid (zoom 0..18)
Google roadmap (zoom 0..18)
Google satellite (zoom 0..18)
MapBox Warden (zoom 0..17)
MapQuest OSM & Aerial (zoom 0..18)
MapQuest Hybrid (zoom 0..18)
OSM Thunderforest Cycle (zoom 0..18)
OSM Thunderforest Landscape (zoom 0..18)
OSM OpenPisteMap (zoom 0..18)
OSM OpenSeaMap (zoom 0..18)
OSM Thunderforest Transport (zoom 0..18)
OSM OpenWeatherMap (zoom 0..18)
Skobbler maps (zoom 0..18)
Stamen Toner (zoom 0..18)
Stamen Watercolor (zoom 0..18)
Yandex Maps (zoom 0..7 in many areas)
Bing road & satellite & hybrid (zoom 1..18)
Esri National Geographic (zoom 0..12)
Esri Reference/World Transportation (zoom 0..18)
Esri Soil Survey (North America, zoom 0..16)
Esri Navigation Charts (parts of the world, zoom 0..10)
Esri World Imagery (zoom 0..17)
Esri Physical (zoom 0..8)
Esri World Street Map (zoom 0..18)
Esri World Topo Map (zoom 0..18)
Geocommons Acetate (zoom 2..18)
Google high-res road & terrain (zoom 0..18)
Google hybrid (zoom 0..18)
Google roadmap (zoom 0..18)
Google satellite (zoom 0..18)
MapBox Warden (zoom 0..17)
MapQuest OSM & Aerial (zoom 0..18)
MapQuest Hybrid (zoom 0..18)
OSM Thunderforest Cycle (zoom 0..18)
OSM Thunderforest Landscape (zoom 0..18)
OSM OpenPisteMap (zoom 0..18)
OSM OpenSeaMap (zoom 0..18)
OSM Thunderforest Transport (zoom 0..18)
OSM OpenWeatherMap (zoom 0..18)
Skobbler maps (zoom 0..18)
Stamen Toner (zoom 0..18)
Stamen Watercolor (zoom 0..18)
Yandex Maps (zoom 0..7 in many areas)