Designed by Paul D. Hunt
Source® Sans Pro, Adobe's first open source typeface family, was designed by Paul D. Hunt. It is a sans serif typeface intended to work well in user interfaces.
You can download font files directly and install them with Font Book. However, it’ll be much easier to install these fonts with RightFont — the best font manager for Mac.
These fonts are licensed under the Open Font License.
You can use them freely in your products & projects - print or digital, commercial or otherwise.