Google Earth

Google Earth lets you fly anywhere on Earth to view satellite imagery, maps, terrain, 3D buildings and even explore galaxies in the Sky. You can explore rich geographical content, save your toured places and share with others.

Google Earth Plus - $20

Google Earth Plus is a $20 annual subscription upgrade to Google Earth. Offers faster performance, GPS tracking support, sharper printout

Google Earth Pro - $400

"With Google Earth Pro, it’s easy to research locations and present your discoveries. In just a few clicks, you can import site plans, property lists or client sites and share the view with your client or colleague. You can even export high-quality images to documents or the web."

Mapquest

Awkward search tool and navigation.

Multimap.com

Great navigation. Excellent maps

National Geographic maps

Starts with clickable map of world.