GNUstep
Software
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GNUstep is a free software implementation of the Cocoa 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... Wikipedia
Programming language: Objective-C
Developer(s): GNUstep Developers
Preview release: only in the SVN software repository
Stable release: make 2.9.0, base 1.28.0, gui 0.29.0, back 0.29.0 / May 6, 2021; 2 years ago