Editing OpenStep (section)

{{More citations needed|date=March 2023}}
{{Short description|Defunct object-oriented application programming interface specification}}
{{Infobox software
| logo = NeXT logo.svg
| screenshot = 
| caption = OPENSTEP's desktop and Workspace Manager
| collapsible = 
| author = 
| developer = [[NeXT]], [[Sun Microsystems]]
| released = {{Start date and age|1994|10|19}}
| discontinued = 
| latest release version = 
| latest release date = <!-- {{Start date and age|YYYY|MM|DD|df=yes/no}} -->
| latest preview version = 
| latest preview date = <!-- {{Start date and age|YYYY|MM|DD|df=yes/no}} -->
| programming language = [[Objective-C]]
| operating system = [[Solaris (operating system)|Solaris]]; [[Windows NT]]; [[Unix-like]] operating systems with the [[Mach (kernel)|Mach]] kernel
| platform = [[IA-32]], [[PA-RISC]], [[SPARC]]
| size = 
| language = English
| genre = [[Application programming interface]]
| license = 
| website = {{URL|http://www.gnustep.org/resources/OpenStepSpec/OpenStepSpec.html}}
}}

'''OpenStep''' is an [[object-oriented]] [[application programming interface]] (API) specification developed by [[NeXT]]. It provides a framework for building [[graphical user interface]]s (GUIs) and developing software applications. OpenStep was designed to be platform-independent, allowing developers to write code that could run on multiple operating systems, including [[NeXTSTEP]], [[Windows NT]], and various [[Unix]]-based systems. It has influenced the development of other GUI frameworks, such as [[Cocoa (API)|Cocoa]] for macOS, and [[GNUstep]].

OpenStep was principally developed by NeXT and [[Sun Microsystems]], to allow advanced application development on Sun's operating systems, specifically [[Solaris (operating system)|Solaris]]. NeXT produced a version of OpenStep for its own [[Mach (kernel)|Mach]]-based Unix OS, stylized in all capital letters as '''OPENSTEP'''.<ref>{{cite web |title=OPENSTEP 4.2, Intel version. Screen shots. |author-first=Nathan |author-last=Lineback |url=http://toastytech.com/guis/openstep.html |website=Toastytech.com}}</ref> The [[software libraries]] that shipped with OPENSTEP are a superset of the original OpenStep specification, including many features from the original NeXTSTEP.