Comment by Rochus

My major system programming languages are C and C++, but I did some projects in Oberon (which turned out to be not particularly suited for systems programming), and then created a modified, better suited version of it called Oberon+ (https://github.com/rochus-keller/Oberon), which I e.g. used to create platform-independend versions of different Oberon System generations.

But Oberon+ is still too high-level for many system programming tasks. So I'm designing a new system programming language called Micron (for Micro Oberon, see https://github.com/micron-language/specification) which has the full power of C without its disadvantages. You can even use it for the OS boot sequence when there is no stack and no heap, but also for higher-level application development, due to its selectable language levels.