EzMath is an editor for mathematical expressions. It uses a markup language of its own which is easy to read, and it can also export content MathML (See MathMl).

There is also a plug-in to display algebra in, e.g., NetscapeNavigator.

For details see http://www.w3.org/People/Raggett/EzMath/

-- JohnFletcher
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See also MathWiki