LyX is a GUI word processor that uses LaTeX for printing and supports structural editing of LaTeX markup. There is a LaTeX package that generates DocBook, and a how-to document describing how to write SGML and XML in the LyX GUI.

GNU TeXMacs is a project aimed at producing an editor that is good for technical and mathematical material, including displayed formulas. 1.0 was released in April 2002. The developers plan XML support in the future, but it's not there yet.

Most people still hack DocBook tags by hand using either vi or emacs.