Forth can be the whole operating system.
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Forth is low-enough level to write device drivers and operating systems. Really understand how the computer works.
Forth is lightweight enough to program microcontrollers. This means you can use it in maker projects.
Forth is an expressive enough to also be called a high-level language. It's easy to create domain specific languages in Forth. This is a characteristic it shares with Scheme.
There are multiple versions to choose from, including some with permissive open source licenses.
PForth.
If you're looking for a very low-level language, you may want to consider learning assembly language, it's much easier to maintain than Forth code.
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