SciWriter 

SciWriter is an XML based WYSIWYM word processor that completely integrates writing mathematics and text in the same environment. The native document format of soft4science SciWriter is a subset of XHTML 1.1 and MathML 2.0
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xmlBlueprint XML Editor 

The fast XML editor for Windows.
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LiteralMath 

Text editor with the additional capabilities of math notation and hypertext, aimed at the high school / college environment. Uses the RTF format known to Wordpad, Word. Generates HTML, so that math notation can be displayed by popular browsers.
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