Simple Calculator Alternatives

SpeedCrunch is a free, fast, high precision open source algebraic calculator with an intuitive interface and many features, such as variables, syntax highlighting, functions, persistent input history & more.

Qalculate! is a multi-purpose cross-platform desktop calculator. It is simple to use but provides power and versatility normally reserved for complicated math packages, as well as useful tools for everyday needs (such as currency conversion and percent calculation).

A simple yet powerful calculator that includes standard, scientific, and programmer modes, as well as a unit converter. It's the perfect tool to add up a bill, convert measurements in a recipe or other project, or complete complex math, algebra, or geometry problems.

Calculator provides simple and advanced mathematical functions in a beautifully designed app.

Calculator is an application that solves mathematical equations and is suitable as a default application in a GNOME Desktop environment.

RealCalc Scientific Calculator.

NumWorks designed an intuitive and evolutive graphing calculator to make learning maths easier.

Calculator++ is an advanced, modern and easy to use scientific calculator.

Calcbot is a simple and beautifully designed calculator for your iPhone, iPod touch and iPad. You’ll never open the built-in Calculator app again.

Omni Calculator is a web/mobile calculator that solves concrete problems such as mortgage payment, gross margin, body mass index, break-even point, etc. It's very user-friendly, flexible and usable on web, mobile and as an embeddable web widget.