Wolfram Alpha
Wolfram Alpha is a "Computational Knowledge Engine" - different from a search engine, it answers factual queries directly by computing the answer from structured data, rather than providing a list of documents or web pages that...
Soulver helps you do quick calculations and work things out. Use Soulver to play around with numbers, do "back of the envelope" calculations, and solve day-to-day problems.
Maths on a Mac as it should be. Soulver is a new kind of calculator application which uses a simple yet powerful wordprocessor style interface instead of the traditional "button" approach to doing math.
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mathematics natural-language-processing calculator