I am sorry, this is a third entry today. I remembered one more
nice software piece:
See the downloadable applet DragMath
http://www.dragmath.bham.ac.uk/
where you get MathType functionality inside any web browser with java.
As DragMath is open-source, you are free to download and re-distribute.
DragMath requires Java 1.4.2 or later
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