Well, there's the Mozilla Location Service (MLS) 1), mentioned before 2) which has a completely open API. Of course, coverage is still rather spotty in places.

Well, there's the Mozilla Location Service (MLS) 1), mentioned before 2) which has a completely open API. Of course, coverage is still rather spotty in places. 1) https://location.services.mozilla.com/ https://location.services.mozilla.com/ 2) https://news.ycombinator.com/item?id=8525148 https://news.ycombinator.com/item?id=8525148