Comments by Rou1997 (Top 1 by date)

Yes, there is many VPS OS X services, I tried them, this is original OS X, you can install Xcode and write and build for OS X and iOS.
It is paid, but quite cheap to use if you need Apple PC rarely.

Alternatively, you can install Hackintosh or OS X into virtual machine, or Hackintosh onto your physical IBM-compatible machine.
It is free, but requires powerful hardware, and it will not be an original Apple system.