This project was developed by combining the OpenStreetMap layers in design using the Leaflet JS library.
No, it's completely free and open source.
-> OpenStreetMap.Mapnik
-> OpenTopoMap
-> CyclOSM
-> Esri.WorldStreetMap
-> Esri.DeLorme
-> Esri.WorldImagery
-> Esri.WorldPhysical
-> Esri.NatGeoWorldMap
-> CartoDB.DarkMatterNoLabels