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Mathcad is an easy to use graphical calculation program targeted at engineering professionals. It supports a wide variety of mathematical functions. There were versions for DOS, Macintosh, and Windows.

MatLab is a high speed, interactive programming utility for manipulating, calculating, and plotting complicated mathematical equations. It is considered easy to use for those familiar with typical algebra equations.

StatWorks, from Cricket Software, is a very powerful statistics software package for the Macintosh designed for a wide variety of applications. It enables all who work with numbers to do statistical computations without spending hours learning "high level" languages or going through several stages to compile analysis.