Emacs Muse is an authoring and publishing environment for Emacs.  It
simplifies the process of writings documents and publishing them to
various output formats.

Emacs Muse consists of two main parts: an enhanced text-mode for
authoring documents and navigating within Muse projects, and a set of
publishing styles for generating different kinds of output.

Homepage:
https://www.gnu.org/software/emacs-muse/index.html
