Adobe has released the first open source font family Source Sans Pro, advocating visual simplicity, its early version was used in Strobe Media Playback.
Provide download package, also on online font store site Typekit WebInk, and the Google Web Fonts.
Source Sans Pro was mainly intended for the Adobe-sponsored open source projects, such as online web code editor Brackets.
Of course, it also can be freely distributed and modified. The font is distributed according to the OSI License SIL Open Font agreements.