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MacInTax, from Intuit Inc, was a Macintosh program that helped one prepare their taxes. It has a friendly user interface, and walks users through an "Interview" to gather required information.
MacWrite was one of two applications released with the Apple Macintosh in 1984 - the other being MacPaint. These applications defined the Macintosh, and helped define what users expected from GUI applications.
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.