### Org `org-mode` ``` #+BEGIN_SRC emacs-lisp ;; Code #+END_SRC ``` ### Markdown [`markdown-mode`](https://github.com/jrblevin/markdown-mode) ```elisp ;; Code ``` ### Stack Overflow Not sure this is an actual thing or just their own. ``` <!-- language: lang-el --> ;; Code ``` There are also reStructuredText and Sphinx which are probably less used.