Google Fuchsia is a capability-based, real-time operating system (RTOS) being developed by Google.

https://en.wikipedia.org/wiki/Google_Fuchsia

15 years ago I waited for GNU Hurd, but now I am very interested how Google Fuchsia turns out. What I read it shapes up nicely, and I can imagine we all will use it in near future instead of Windows and other binary blob legacy operating systems; it might also replace Linux as Android kernel - but that is still just speculation.

Minix 3 for reliability part, DROPS for real-time part, OKL4 for mobile, and Genode for security part are basically it that I'm aware. It's really the mix of capabilities in one system that makes QNX great. I don't know anything that has that despite the architecture described in great detail in freely-available papers. Just waiting to be cloned or improved on. :)

http://www.minix3.org/doc/reliable-os.pdf

https://os.inf.tu-dresden.de/drops/overview.html

http://l4hq.org/projects/kernel/

https://genode.org/about/index

FreeRTOS is here: http://www.freertos.org/

Though the "RT" is the only real overlap. It's targeted more at lower end hardware, but does have an x86 implementation.

> "google-fu"

nice combination!