OS X Mavericks
Operating system
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OS X Mavericks is the 10th major release of macOS, Apple Inc.'s desktop and server operating system for Macintosh computers. OS X Mavericks was announced on June 10, 2013, at WWDC 2013, and was released on October 22, 2013, worldwide. Wikipedia
Initial release date: October 22, 2013
Source model: Closed, with open source components
Update method: Mac App Store