OS X Yosemite
Operating system
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OS X Yosemite is the eleventh major release of macOS, Apple Inc.'s desktop and server operating system for Macintosh computers.
OS X Yosemite was announced and released to developers on June 2, 2014, at WWDC 2014 and released to public beta... Wikipedia
Developer: Apple Inc.
Latest release: 10.10.5 (Build 14F2511) / July 19, 2017; 6 years ago
Platforms: x86-64
Source model: Closed, with open source components
Update method: Mac App Store