Emacs/W3 is a text-based web browser for the GNU Emacs text editor, written primarily by William M. Perry and entirely in GNU Emacs Lisp. Emacs/W3 is part of the Sumo package for XEmacs, and the submodule for fetching an URL is currently part of the GNU Emacs CVS repository.
As noted by the maintainer, the W3 package is currently monolithic and somewhat obsolete. A project has been proposed to reengineer W3 for increased modularity. More current Emacs web browsers include an interface to w3m.
Dave Raggett was supported by Emacs/W3 and by tkWWW while working on a successor to HTML 2 called HTML+.