GNU Emacs

GNU Emacs is a powerful, extensible, self-documenting text editor. It is released by the Free Software Foundation and under development since 1976. In Gentoo GNU Emacs is maintained by the team of the same name, which can be reached through [mailto:emacs@gentoo.org emacs@gentoo.org]. Detailed developer information can be found on the project page.

Installation
Explanation of USE Flags:

Several versions side-by-side
Explain eselect

Configuration
You can customize Emacs by clicking through the GUI (use M-x customize-group) or with your which's written in emacs-lisp, Emacs' own Lisp-dialect.

Documentation
For a quick-start documentation, type in Emacs: For further help on how to use Emacs, start  and type Control-h and then r.