I think you'll find that SPSS runs on a great many platforms.
If you are
seriously involved in statistics, then I think that "the best statistics package for your job," whatever that is, definitely qualifies as a
"killer app."
A "killer app" is something that you buy hardware and/or operating-systems specifically in order to run that app. For example, if you 'like' to run Linux but you 'need' to run SPSS, and you choose to run (say) an existing Win32-based license that you have, then one possibility is to transport thy derierre forthwith
to the local electronics store and
buy a Windows laptop (say...) just so that you can "run that app."
(As a matter of fact, I am perfectly serious, and I have not yet gone to the pub.)