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://orgmode.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.