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...

Freemium Android iPhone iPad Web Kindle Fire Windows Phone

Precise Calculator

Programmable scientific calculator which has more than 150 mathematical functions and all of them return as many digits as you need. It can calculate with real numbers, complex numbers, fractions, vectors, matrices.

Free Open Source Windows

Arithmate Pro Calculator

A modern, scientific calculator that is easy to use. While other calculators display only one number at a time, this one shows you the whole expression you are inputting, leading to a much more user friendly experience.

Commercial Android

Omni Calculator

Omni Calculator is a web/mobile calculator that solves concrete problems such as mortgage payment, gross margin, body mass index, break-even point, etc.

Free Android iPhone iPad Web

ESBCalc

ESBCalc is a Freeware Scientific Calculator for Windows with Infix Notation, Brackets, Scientific Functions (Trigonometric, Hyperbolic, Logarithmic - including Base 10, Base 2 & Natural - plus more), Memory, Paper Trail, Result History...

Freemium Windows

MyScript Calculator

With MyScript Calculator, perform mathematical operations naturally using your handwriting.

Free Android iPhone Android Tablet iPad

Insect

High precision scientific calculator with full support for physical units (web and terminal versions).

Free Open Source Mac OS X Windows Linux Web Self-Hosted

Calca

A simple math notebook that calculates as you type, with powerful features such as equation solver and functions.

Commercial

Calculator Plus

Calculator Plus is a nice addition to hundreds of Calculator apps but with unique idea and innovative and user friendly designed buttons. A sound and smart person...

Free Android

eCalc Scientific Calculator

An easy to use scientific calculator with many advanced features to help you solve algebra, trigonometry, and engineering math problems. The calculator comes with six...

Commercial Mac OS X Windows

Calculate

A math expression calculator with persistent memory for variables and functions. Any JavaScript expression can be evaluated. - Click the C button to clear the output...

Free Mac OS X

ECW Expression Calculator

ECW Expression Calculator is an advanced expression calculator with the following features: * display result as decimal/hex/bin/oct/exponential * standard and...

Free Windows

CCCalc

CCCalc is a calculator with tape, you can correct any printed character with, and the tape recalculates everything itself. Unlimited precision, visible and even...

Free Windows

Online Terminal Calculator

Online terminal based calculator, it is one of the most productive calculator in online, it uses terminal based approach instead of traditional push button based.

Free Web

Ruvenss Calculator

Simple yet very effective calculator with print capabilities and log registration.

Free Mac OS X Windows Linux Chrome OS

Notepad Calculator

For jotting down quick calculations. Mix free form text with calculations and see the results appear in the right hand margin as you type.

Free Open Source Web

errProof

The website has a lot of useful and unique tools.

Free Web

Wakari

Wakari provides web-based Python data analysis via embedded iPython notebooks. Embedded IPython Notebook Work in the cloud with IPython notebook. You may also...

Freemium Web

Worksheets

Enter quickly any mathematical expression and get a fast evaluation. Worksheets remembers all operations and results: undo them by a simple click. Worksheets understands...

Commercial