For markup language editors, see main page under "Word Processing". Most editors have special modes for this.
For VRML, see in Graphics.
Misc:
HTML:
SMGL:
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The SGML Web Page
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SGMLtools  "a text-formatting package based on SGML (Standard Generalized Markup
Language), which allows you to produce LaTeX, HTML, GNU info, LyX, RTF, and plain
ASCII (via groff) from a single source" (USA mirror of www.sgmltools.org .)
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Standard ML of New Jersey
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InfoPrism "a general document processing system that translates SGML
source files to different output formats like HTML, Texinfo, LaTeX and plain text."
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Sample Plug-In SMGL Source Template  Oct'96 LG
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Jade  "validation and formatting of SGML or XML"
XML:
Last Modified 19-Apr-1999
End of page.