[elsurudo]

Not that generic – Apple uses "kit" as a suffix for most of their frameworks, and I don't know any other large frameworks that do that (could be wrong on this, of course, but it does seem an "Apple thing" at this point).

[kellyjprice]

I can think of 2 much older examples of 'kit', as a part of toolkit, in a UI framework name:

* GTK

* Tk of Perl/Tk

[huxley]

NeXTSTEP (macOS and iOS's predecessor) predates Tk's the use of the term kit by 3 years and GTK's by almost 10.