Replying to the subject, I'm surprised there's not more association between Forth and Plan 9. Both seem to be based on changing design goals to make the software simple. ;) The biggest difference for me is the Forth world tells you how. (It's a bigger world, so there are more people to write books, I guess.) In Plan 9, we just get heavily-factored C code without explanation. Not knowing why it's factored, we misapply the term "bikeshedding". I knew I should have read Thinking Forth years ago.
Now I'm wondering how much of Plan 9 development time went into factoring for minimalism.