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Grammatik is a standalone grammar checker, and was possibly the first grammar checker for personal computers. Later versions were built in to Word Perfect. It competed against RightWriter.
Mathcad is computer software primarily intended for the verification, validation, documentation and re-use of engineering calculations.
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.