Printmaps.net - Make high-dpi maps for print applications within minutes, using the Printmaps editor. Put custom geo data such as routes or shapes onto your map, or geocode hundreds of addresses to populate your map with POIs.
Snazzy Maps - Simple & Free To Use Themes for Google Maps
Google Maps - Find local businesses, view maps and get driving directions in Google Maps.
Stamen Maps - Turn any OpenStreetMap location into a watercolor painting
StepMap - With StepMap you can create maps for free.
MapStyle - MapStyle is a huge library providing a plethora of options for styling the map with detailed customization support.