When Apple has released stuff as open source software, it has either been because they were forced to by the license, or because it was for software that primarily runs on OS X.
Clang puts the lie to this.
The lack of data both [Apple and Amazon] deliver is frustrating for marketers because these notoriously opaque giants sit atop incredible troves of information about what consumers actually buy and like, as well as who they are and where they live. One person familiar with the situation said Apple's refusal to share data makes it the best-looking girl at the party, forced to wear a bag over her head.
FORTRAN is not a flower but a weed -- it is hardy, occasionally blooms, and grows in every computer. -- A.J. Perlis