OS X Mavericks
OS X Mavericks is the 9th version of client Mac OS X. It was announced at June 10, 2013, at WWDC 2013. The RTM was released on October 22, 2013. It is available for free at the Mac App Store.
Updates: OS X 10.9 -Initial release
OS X 10.9.1 -
OS X 10.9.2 -Improved 1080p output
OS X 10.9.3 -
OS X 10.9.4 -
OS X 10.9.5 -