At the CompUSA event, a nice Danish man (I'm sorry, I can't remember his name), told me about a program called R <http://www.r-project.org/>. It's supposed to be a like S-plus, so i think it's more for statistics/probabilities/finite math than calculus, but i thought i'd mention it.

Of course for intregration there is always the integrator,
http://integrals.wolfram.com/index.cgi
(basically mathematica hooked up to a web interface)

--Ray

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