There's a list at http://dmoz.org/Science/Math/Software/Typesetting/
There's a good program for Word called Mathtype. Easy to use. It's drag and drop system, but the software is quite expensive.
But there are many programs that aren't designed to work with word and give amazing results:
Just try OpenOffice or LaTex, but if you are trying LaTeX prepare yourself of some hours of training until you manage the basics. But once you know them, the only limit for writing will be your imagination.
Originally Posted by CaptainBlack
You are right, and they should also render the equations in html as well......grrrr I am trying to get laTex or mimetex working for html pages and so far they are proving well beyond my abilites to get on my machine at all. Seems impossibly difficult adn instructions are so far beyond my comp skills i dont even know what they are talking about.
My wish list is an easy to use, free, equation editor that will work on web pages and forums like this. Just whip it up in Word or somesuch and paste.