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
describing how to write SGML and XML in the LyX GUI.
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
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