GNUstep is a free software implementation of the Cocoa (formerly OpenStep) Objective-C frameworks, widget toolkit, and application development tools for Unix-like operating systems and Microsoft Windows. It is part of the GNU Project.

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The GNUstep Project
Developer(s)GNUstep Developers
Stable release
make 2.9.0, base 1.28.0, gui 0.29, back 0.29 / May 6, 2021; 18 months ago (2021-05-06)
Preview release
only in the SVN software repository
Repository
Written inObjective-C
Operating systemCross-platform
TypeWidget toolkit
LicenseGNU General Public License for the applications
GNU Lesser General Public License for the libraries.
Websitewww.gnustep.org
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GNUstep features a cross-platform, object-oriented IDE. Apart from the default Objective-C interface, GNUstep also has bindings for Java, Ruby,[2] GNU Guile and Scheme.[3] The GNUstep developers track some additions to Apple's Cocoa to remain compatible. The roots of the GNUstep application interface are the same as the roots of Cocoa: NeXTSTEP and OpenStep. GNUstep thus predates Cocoa, which emerged when Apple acquired NeXT's technology and incorporated it into the development of the original Mac OS X, while GNUstep was initially an effort by GNU developers to replicate the technically ambitious NeXTSTEP's programmer-friendly features.

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