SciWriter

SciWriter is an XML-based scientific editor that completely integrates writing mathematics and text in the same environment. The native document format is a subset of XHTML 1.1 and MathML 2.0 Presentation Markup.
Print Publishing: A SciWriter document can be exported to LaTeX and be published as PDF, Postscript or DVI.
Web Publishing: SciWriter documents can be published on the web as XHTML+MathML or as HTML with equations as images.