GNUstep

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GNUstep

Window Maker and a variety of applications were developed with the GNUstep libraries, including a gomoku game, calculator, and TextEdit.
Developer(s)	GNUstep Developers
Stable release	make 2.9.2, base 1.30.0, gui 0.31.1, back 0.31.0 / June 6, 2024; 7 months ago (2024-06-06)
Preview release	on the GitHub software repository
Repository	github.com/gnustep
Written in	Objective-C
Operating system	Cross-platform
Type	Widget toolkit
License	GNU General Public License for the applications GNU Lesser General Public License for the libraries.
Website	www.gnustep.org

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.

GNUstep features a cross-platform, object-oriented IDE. Apart from the default Objective-C interface, GNUstep also has bindings for Java, Ruby,^[1] GNU Guile and Scheme.^[2] 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.