The best i've found for a moderate amount of money is the MathType update for equation editor in word. It has pretty much anything you would ever need.
It can be used with word or as a standalone program and has a free 30-day trial.
http://www.dessci.com/en/products/mathtype/
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"Empirically observed covariation is a necessary but not sufficient condition for causality" - Edward Tufte
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