Mapbox.js is free: it’s an
open source project that you can download
and modify. It’s also free for usage: you can use our hosted version of Mapbox.js
for any use, including use with services other than Mapbox.
If you use Mapbox.js in a project, you don’t need to attribute its use. If you
include its source in another open source project, please read and follow its BSD license.