This one it seems: https://www.maptiler.com/maps/#style=streets-v2&mode=2d&lang=auto&position=15.6/51.508662/-0.097205/0.00/60.0 https://www.maptiler.com/maps/

This one it seems: https://www.maptiler.com/maps/#style=streets-v2&mode=2d&lang=auto&position=15.6/51.508662/-0.097205/0.00/60.0 https://www.maptiler.com/maps/#style=streets-v2&mode=2d&lang... It looks like it uses OpenStreetMaps data.