Are Apple platforms the only place Objective-C is a good choice?

Programmer Question

If you are not developing for an Apple platform, are there reasons to choose Objective-C? I know of GNUstep (which I do not find visually pleasing), but what else is there?

If you want to develop for multiple platforms, including OS X or iOS but also Linux or Windows, when might Objective-C be a good choice?

Find the answer here