Mac OS X 10.7

Mac OS X 10.7 Lion Beta 1 was released in January 2011, but was shown off by Apple at WWDC 2011, and was released in July 2011, it also comes free with FaceTime for HD video calling with other Mac, iPhone's, iPad's and iPod Touch's.

Features
A lot of Lions new features were inspired by its Mobile OS cousin, iOS, one of the notable new features is LaunchPad, it creates a iOS like homescreen to browse apps, another feature is Multitouch Gestures.