OpenStep
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OpenStep is an Application Programming Interface (API) for creating applications using the Objective C language. It was published by NeXT Computer Inc. in 1994.
OpenStep consists of three parts: the FoundationKit, a library of non-graphical objects; the AppKit, a library of objects useful in creating graphical applications; and Display Postscript, an interface for drawing to the screen using the PostScript graphics language.
The OpenStep specification is available in a couple of different formats from [1].