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SpeedCrunch. SpeedCrunch is a high-precision scientific calculator featuring a fast, keyboard-driven user interface. It is free and open-source software, licensed under the GPL. Download Documentation Donate .

WolframAlpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.

Mathway is a freemium math solving app that helps you find the solutions to any math problem you can imagine.

Qalculate! is a multiplatform multi-purpose desktop calculator.

Open Source

Any individual who has ever gazed restlessly at a knotty condition needing an answer has longed for some sort of hatchet to slice through the issue.

Photomath is a mobile app that will give you the ability to test your equations through a simple calculator interface that will fully explain the solution in a step-by-step fashion. Read more about Photomath.

Step by step calculator

Avogadro is a free, fantastically easy to use molecule editor.

Numi is a beautiful text calculator for Mac.

Open Source

fxSolver is an free online math solver, equation library, graphing calculator and science/engineering problem helper. To get started, add some formulas, fill in any input variables and press "Solve."

ChemDraw - The Gold Standard for Chemical Structure Drawing and Research Publications.

Soulver is a software application that functions as a calculator that allows you type a continuous stream of information rather than having to input data into multiple cells.

PyMOL is a powerful and comprehensive molecular visualization product for rendering and animating...