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 `Foundation____Kit', a library of non-graphical objects; the `App____Kit', 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].