MacOS
From BetaArchive Wiki
Apple Mac OS X is the operating system for Apple Macintosh computers on the PowerPC (PPC) and Intel x86 platform. The latest version of OS X is Snow Leopard, Build [Enter Build Here]
Known versions
Cheetah (10.0)
Puma (10.1)
Jaguar (10.2)
Panther (10.3)
Tiger (10.4)
Leopard (10.5)
===Snow Leopard (10.6)