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SpeedCrunch is a free, fast, high precision open source algebraic calculator with an intuitive interface and a extensive list of features, including: Unlimited Variables, Syntax Highlighting, Functions, with 'Automagic' Completion, 50 Decimal Precision, Input History and more...

Maths on a Mac as it should be. Soulver is a new kind of calculator application which uses a simple yet powerful word-processor style interface instead of the traditional "button" approach to doing math.

RealCalc Scientific CalculatorAndroid's #1 Scientific Calculator. A fully featured scientific calculator which looks and operates like the real thing.Looking for fractions? Degrees/minutes/seconds? Landscape mode? You need RealCalc Plus. See elsewhere on this page for the link, or select 'Upgrade' from the RealCalc menu.RealCalc includes the following features:* Traditional algebraic or RPN operation* Result history* Unit conversions* Physical constants table* Percentages* 10 memories* Binary, octal, and hexadecimal* Trig functions in degrees, radians or grads* Scientific, engineering and fixed-point display modes* Configurable digit grouping and decimal point* Full built-in help* A complete lack of advertisingRealCalc Plus contains all these features, plus:* Fraction calculations and conversion to/from decimal* Degrees/minutes/seconds calculations and conversion* Landscape mode* User-customizable unit conversions* User-customizable constantsIf you find RealCalc useful, please consider purchasing RealCalc Plus to support further development. Thank you.FAQ:* If you want data size conversions in multiples of 1024, use kibibytes, mebibytes, gibibytes, etc - see en.wikipedia.org/wiki/Kibibyte.* If the percent key appears to give wrong answers, make sure you are pressing '=' at the end, e.g. '25 + 10 % =' will give 27.5.* If sin/cos/tan functions don't give the answer you are expecting, make sure you are in the correct angle mode. Degrees, radians and grads are supported, indicated by DEG, RAD, GRAD in the display. Use the DRG key to change mode.* If any of the digit keys are disabled, or the decimal point doesn't work, or you have answers with letters in, or basic arithmetic appears to be wrong, then you are in binary, octal or hexadecimal mode. Press DEC to return to decimal operation. If you don't need these modes, please make sure that 'Enable Radix Modes' is disabled in the settings.Please read the help for more information. »

Windows Calculator, commonly known as Calculator from the application's title bar, is a calculation application included in all versions of the Microsoft Windows operating system. It can be activated by the command "calc" on most Windows systems.

Numi is a handy calculator app for Mac. It allows to describe tasks the natural way and instantly get an accurate answer. For example, $20 in euro - 5% discount or today + 2 weeks. Numi is not limited to simple calculations, it can solve expressions of any complexity, with parentheses, mathematical operations and high accuracy (up to 38 mantissa digits).

handyCalc is a powerful calculator with automatic suggestion and solving which makes it easier to learn and use.With almost all the features you can imagine on a calculator, waiting for you to explore.

Omni Calculator is a startup aiming in solving all (hence "omni" in the name) small math problems you have in your everyday life. All of their calculators offer unparalleled ease of use and functionality. They work in real time and can solve for any variable. You are able to share the result with your friends and co-workers. They can be used on web, mobile or embedded on external websites with a slick, fully functional calculator widget.

Calculator with log and printing capabilities.

errProof offers a collection of web-based unique tools for any user

Calculator Pro for iPad Free is designed for everyone looking for simplicity and functionality. The app features two calculators sporting elegant interface that won't leave anyone indifferent. Users who want to make basic calculations will definitely enjoy the standard option while math gurus will find it very handy to use a scientific calculator in landscape mode.

GlassCalc is a free, Windows calculator designed for quick input via keyboard. It forgoes the usual array of buttons for a single textbox where you can type an equation or mathematical expression, hit Enter, and get a result.