[jrajav]

Not entirely related (though I think someone actually is working on a web framework for it): ObjFW [1][2] is an Objective-C framework and runtime that provides Cocoa-like classes and methods, but with more open-sourceness and portability. It even runs on Raspberry Pi!

[1]: https://webkeks.org/objfw/

[2]: https://github.com/Midar/objfw (Mirror)

[nglevin]

Recently added support for Haiku, too.

Midar doesn't slack around when it comes to portability. :)