A lot of the capabilities described for DolDoc, and for TempleOS documents in general, also exist in Emacs' org-mode, albeit of course in a rather different style -- inline images, hyperlinks to live searches as well as static content, and the like.
You can also embed code fragments of arbitrary length, in any or all of dozens of languages, and execute them inline with arbitrary input, including both other sections of the same document and the output of other code snippets therein. (TempleOS seems to have a similar capability, but of course only for the single language in which everything to do with it is implemented.)
It's a cliche, but Emacs really is almost like a LISP operating system disguised as a text editor. It's easily possible to use a computer productively using nothing else, if you devote a bit of time to learning how.
You can also embed code fragments of arbitrary length, in any or all of dozens of languages, and execute them inline with arbitrary input, including both other sections of the same document and the output of other code snippets therein. (TempleOS seems to have a similar capability, but of course only for the single language in which everything to do with it is implemented.)