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Mathcad is computer software primarily intended for the verification, validation, documentation and re-use of engineering calculations.
Mathematica, from Wolfram Research, Inc., is a mathematical and scientific application to formulate complex equations. and Mathworks MatLab.
Stacker, from Stack Electronics, was a hard drive compression tool. It was wildly popular until Microsoft virtually eliminated the third party market for this by including their own drive compression tool with MS-DOS 6. and Expandz! Plus.