The Font Awesome font is licensed under the SIL OFL 1.1:

    http://scripts.sil.org/OFL

Font Awesome CSS, LESS, and Sass files are licensed under the MIT License:

    http://opensource.org/licenses/mit-license.html

Attribution is no longer required as of Font Awesome 3.0, but much appreciated:

    Font Awesome by Dave Gandy - http://fontawesome.io

Full details: http://fontawesome.io/license