QNX is still around and being developed (i think)
I wish BB made it easily available for non-commercial
use
By the way, you can compile almost all FreeBSD packages with a bit of care and get a full desktop running on QNX. QtCreator, Firefox, even VSCode can be made running native on QNX (not that anybody would be interested in it though...)
In short, all the interesting stuff actually happens above the kernel, not below. The kernel just does some grunt work of VMM and IPC.
Ah, I understand what you said reading it again. You are right, that is "beneath the kernel" not "below".