OS X Mavericks

OS X Mavericks, or OS X 10.9, is the tenth major release of the OS X operating system released on 22 October 2013. This version focuses on battery life improvements, and increased iCloud integration.

Although OS X Mavericks was released together with iOS 7, OS X Mavericks retains a similar user interface design from previous OS X versions. The modern interface wouldn't be utilized until OS X Yosemite in 2014.

It is the first OS X version to be released as a free upgrade on the App Store.

New features and changes

 * App Nap was introduced, which sleeps apps that are not currently visible.
 * iCloud Keychain stores a user's usernames and passwords.
 * AirPlay compatible displays such as the Apple TV can be used as an external display.
 * Finder has acquired tabs, fullscreen support, and document tags.
 * New apps were added: iBooks and Maps.
 * Removal of several skeuomorphic elements.
 * Improvements to Notification Center.