uMap - uMap let you create maps with OpenStreetMap layers in a minute and embed them in your site.
Snazzy Maps - Simple & Free To Use Themes for Google Maps
FacilMap - Map platform for live, collaborative map creation based on OpenStreetMap.
Stamen Maps - Turn any OpenStreetMap location into a watercolor painting
Mapme - Build smart and beautiful maps within minutes with no coding.
MapStyle - MapStyle is a huge library providing a plethora of options for styling the map with detailed customization support.