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As for the OS, I assembled some links here:

https://liam-on-linux.livejournal.com/46523.html

This is a good overview:

http://ignorethecode.net/blog/2009/04/22/oberon/

Oberon, a tiny text-oriented OS, evolved into A2, a graphical OS with a zooming UI called Bluebottle. There's some info about A2/Bluebottle here:

http://sage.com.ua/en.shtml?e1l0

Here is the OS on GitHub:

https://github.com/btreut/a2

There are bare-metal versions for x86 -- I am running it on a Thinkpad X200 as well as under VirtualBox -- and also versions that run hosted on Windows, 32-bit and 64-bit Linux and Mac OS X.

My website has a long article with A2 running and screenshots for all delivered apps.

Also wort mentioning that Active Oberon has the language features that Oberon lacked for manual memory management in unsafe code and co-routines in the form of active objects, hence its name.

Paco (Active Oberon's compiler) is probably one of the first compilers with parallel phases.