Apple has served up an update (version 5.1.1) to its free Xcode developer tool for OS X and iOS for iOS and OS X. The upgrade includes software development kits for OS X 10.9 Mavericks, OS X 10.8 Mountain Lion, and iOS 7.1.
Xcode is designed to make it easy for developer to analyze their code, monitor performance, and test their apps, Xcode 5.1.1 is available at the Mac App Store and requires Mac OS X 10.8.4 or higher.