Google Calculator

SpeedCrunch Portable is a free, fast, high precision open source algebraic calculator with an intuitive interface and a extensive list of features, including: Unlimited Variables, Syntax...

Qalculate! is a multi-purpose desktop calculator for GNU/Linux. It is small and simple to use but with much power and versatility underneath. Features include customizable functions, units, arbitrary...

A calculator for Android. Algebraic entry. Full on-screen history (multi-line display). Use your phone's keyboard or on-screen buttons. Usual functions: trig, log, etc. Parentheses. Copy to clipboard. ...

The Units program converts quantities expressed in various scales to their equivalents in other scales. The units program can handle multiplicative scale changes as well as nonlinear conversions such as...

TTCalc is an open source bignum mathematical calculator. It features arithmetical functions, trigonometric functions, inverse trigonometric functions, hyperbolic functions, inverse hyperbolic functions,...

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, …

Maya is a slim, lightweight, GCal-syncing GTK+ Calendar application written in Vala, specifically for the elementary project.

Online graph sketching app that can graph functions and numerically solve differential equations.

Extcalc is a scientifical calculator for linux which features a intuitive, Qt-based user interface, matrix operations, plotting of 2D and 3D graphs and scripting using a C-like language.

Calculator web-app for JustBrowsing project. Basic 4 function calculator plus square root and exponent functions. Supports keyboard shortcuts and made to resemble a real calculator. Online demo:...