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Re:Uikit – A lightweight and modular front-end framework by kellyjprice on Tuesday November 15, 2016 @06:10PM (#12963175)
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

Re:Uikit – A lightweight and modular front-end framework by huxley on Tuesday November 15, 2016 @07:54PM (#12963719)
NeXTSTEP (macOS and iOS's predecessor) predates Tk's the use of the term kit by 3 years and GTK's by almost 10.