Original Macintosh system 6

Mac System 7

Mac OSX 10.0 Cheetah

Mac OSX 10.1 Puma

Mac OSX 10.2 Jaguar

Mac OSX 10.3 Panther

Mac OSX 10.4 Tiger

Mac OSX 10.5 Leopard

Mac OSX 10.6 Snow Leopard

Mac OSX 10.7 Lion

Mac OSX 10.8 Mountain Lion

Mac OSX 10.9 Mavericks

Mac OSX 10.10 Yosemite

Mac OSX 10.11 El Capitan

Mac OSX 10.12 Sierra