Source Sans Pro
Source Sans Pro is a set of OpenType fonts that have been designed to work well in user interface (UI) environments. In addition to a functional OpenType font, this open source project provides all of the source files that were used to build this OpenType font by using the AFDKO makeotf tool.
Font installation instructions
Send suggestions for changes to the Source Sans OpenType font project maintainer, Paul D. Hunt, for consideration.
For information about the design and background of Source Sans, please refer to the official font readme file.