Made with Natural Earth.
These are the beautiful terrain maps you see when you zoom right out.
OpenStreetMap is a map of the world, created by people like you and free to use under an open license.
Stamen make some great maps and visualizations.
I especially like the waterpaint maps but unfortunately I couldn't get them to work in Flowx.
I think Stamen Design is good example of a company that bridges between business and public-good.
Mapbox is a mapping platform for developers.
They provide some the beautiful maps in Flowx, including the Pirate maps ;-).