OS X Lion
Operating system
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OS X Lion, also known as Mac OS X Lion, is the eighth major release of macOS, Apple's desktop and server operating system for Mac computers.
A preview of OS X 10.7 Lion was publicly shown at the "Back to the Mac" Apple Special Event on October 20,... Wikipedia
Initial release date: July 20, 2011
Year: 2011
Developer: Apple Inc.
Latest release: 10.7.5 (Build 11G63) / October 4, 2012; 11 years ago
License: Apple Public Source License (APSL) and Apple end-user license agreement (EULA)
Source model: Closed, with open source components
Update method: Apple Software Update