Virgil Dupras, the author of the Tumble Forth series there, also authors DuskOS, an OS written entirely in a custom Forth. His consistent and prodigious output really is quite impressive. I don't really hold to the collapse philosophy, but the DuskOS mailing list has just the right amount of volume that it's perfect for lurking.

Virgil's work inspired me to give Forth a bit of a go, and last year I spent some time hand decompiling SmithForth[1]. It really is remarkable how little assembler is required to bootstrap the language. I can totally see how Forth could give you a repl in embedded environments, which sounds way more fun than the typical dev cycle I hear about.

[0]:https://duskos.org/ [1]:https://dacvs.neocities.org/SF/