What is working in nearly every embedded portable device today?

It's an ARM chip : Advanced Risc Machine even in embedded systems the CortexM is in the meantime the fisrt choice:

MBED

The original operating system of ARM for personal computers RISCOS is still alive and becomes a new hardware platform on Pi, Beagle and Pandaboards and many more. This site was created with RiscOS on a Pi2.

ARMINI