The is a distribution of Org-mode, a plain text notes and project planning
tool for Emacs.

The homepage of Org-mode is at http://www.astro.uva.nl/~domnik/Tools/org/

The manual is in the file org.pdf, it includes a section about installation.

The xemacs directory contains special code for XEmacs users, in particular
a port of the GNU Emacs outline.el to XEmacs.  Org-mode does not work
under XEmacs without this file installed.  It did until version 4.37,
but no longer.