At its media event today, Apple announced that OS X Mavericks, the next version of its Macintosh operating system, will launch today on the Mac App Store. Mavericks will be available exclusively through the Mac App Store for free.
Mavericks also includes a number of brand new features, including a new iCloud Keychain function to save passwords across iOS and Mac devices, new Mac apps for iBooks and Apple Maps, along with UI redesigns for a number of built-in applications.
Article Link: Apple Will Release OS X Mavericks Today as Free Download