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