The best alternatives to Stamen Maps are Map Me, reactivesearch.io, and Mapbox. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Stamen Maps?
AssemblyAI— Speech-to-Text API with superhuman accuracy
Mapbox is an American provider of custom online maps, navigation, address search, and location data for websites and applications such as Foursquare, Lonely Planet, Facebook, the Financial Times, The Weather Channel and Snapchat.