[hgs3]

> Question: is Objective-C post 2.0 being actively maintained outside of Apple?

Yes as part of the GNUStep project [1]. You can compile Objective-C with Clang for any platform, including Windows, and link with the GNUStep Obj-C runtime. The big problem is outside of GNUStep and macOS you won't have any frameworks - not even NSString.

> I loved Objective-C very much (yes, really) and I'd like to continue using it after Apple phases it out

You're not alone. Unlike C++, Obj-C was a reasonable OO extension to C. It's a shame the language never received more love.

[1] https://github.com/gnustep/libobjc2

[apple4ever]

You could also use something like ObjFW to get some of those nice classes.