"Apple has always been an open source-friendly company. In fact, as the company's website declares, it is 'the first major computer company to make Open Source development a key part of its ongoing software strategy.' From its Safari browser to its exceptional OS X operating system, Apple is open source to its core (pun unintended).
"So, yes, Apple incorporates open-source projects into its products (which you can follow here). But its adoption of open source goes far beyond development. Apple is also an aggressive purchaser of open-source software. I'm familiar with several open-source companies that do business with Apple..."