from NeXT Computer, Inc.
Mac OS X is the direct descendant of NEXTSTEP. Many concepts from NEXTSTEP are present in Mac OS X, like the dock, the hierarchial file viewer, the font object and the color object.
Installation procedure: Starting
Installation procedure: Choosing packages
Login window: When the wrong password is typed, the login window shakes.
Multiple applications running
About screen: Workspace Manager
File Viewer: here shown in both icon and hierarchial views.
Developer demo application: Billiards
Developer demo application: Molecules
Mail: featuring a letter from Steve Jobs.
Verbal modal dialogs
Color pickers: Standard, RGB, CMYK, HSL, Palette, and Pantone (!).