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MathType
Powerful mathematical typesetting program for word processing and desktop publishing documents. Professional edition of the Equation Editor package bundled with Microsoft Word, Corel WordPerfect, and Appleworks.
http://www.mathtype.com/
OpenMath
Emerging standard for representing mathematical objects semantically, allowing them to be stored in databases and communicated over the World-Wide-Web.
http://www.openmath.org/
SciWriter
An XML based WYSIWYG word processor for mathematics and text. The native document format is a subset of XHTML 1.1 and MathML 2.0 Presentation Markup.
http://www.soft4science.com/