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OpenStreetMap
Data © OpenStreetMap contributors, ODbL 1.0
We're proud to support OpenStreetMap by being corporate members of the OpenStreetMap Foundation
OSMF
The OpenStreetMap Foundation is an international not-for-profit organization supporting, but not controlling, the OpenStreetMap Project.
Geonames
Licensed under Creative Commons Attribution 4.0 License
Who’s On First
Who's On First is a gazetteer of places released under Creative Commons Zero license
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OpenAddresses
Open addresses is an open global address collection, released under public domain
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Mapbox GL JS
Mapbox GL JS is released under the BSD 3-Clause License.
mapbox.js
mapbox.js is released under the BSD 3-Clause License.
Leaflet
LeafletJS library licensed under BSD 2-Clause License
More info