Earlier quoted context omitted.
You can get OSX up and running in VirtualBox/Vagrant. Not that I'd want to do actual development that way, but we do it for iOS CI.
Which is a violation of the OS X EULA. install, use and run up to two (2) additional copies or instances of the Apple Software within virtual operating system environments on each Mac Computer you own or control that is already running the Apple Software, for purposes of: (a) software development; (b) testing during software development; (c) using OS X Server; or (d) personal, non-commercial use. http://www.apple.com…
BTW, I'm sure all Apple Boot Camp and Parallels users pay the $250 Microsoft license, NOT.