Apple Mac OS X is a UNIX-based operating system and since its 10.5 version it's certified againt the Single UNIX Specification. Apple OSs has always been a niche operating systems specifically tailored at the needs of a few. Mac OS X, moreover, must be run on Apple hardware. It's one of the best choices for a desktop operating system and since OS X is UNIX-based, you will be able to select software from the open-source ecosystem built around UNIX in the recent years.
iPhone OS
A famous variant of the Mac OS X Operating System is the iPhone OS, the operating system powering the iPhone device. The iPhone, together with the App Store, is an ideal platform to develop, distribute and sell application for a leading mobile device.
Consulting Reacts has developed strong skills over the years and will help its client build their iPhone applications.