Yes¸ Apple contributes to Xorg and does so steadily since years:
Originally Posted by asdx
Apple contributed and continues to contribute to lots of FOSS.
Everybody with some knowledge about FOSS and without religious hatred against Apple knows that, especially since it is frequently covered by Phoronix, e.g. http://www.phoronix.com/scan.php?pag...item&px=ODUzNA