[sbuk]

Apple used 386BSD (4.3?), some userland from FreeBSD, and the Mach Microkernel from *CMU, all from the acquisition from NeXT, who developed XNU and NeXTStep 18 months-2 years before the Linux kernel was released. The innovative thing with the touch screen was smooth and accurate touch based gestures on a capacitive screen. GUI's were argubably invented by Ivan Sutherland and further developed by Doug Engelbart at SRI, which is where PARC poached the majority of their engineers.

If your going to troll, have the decency to get your facts straight.

* Edited for clarity