Plus42 is a programmable calculator based on Free42.

Free42 HP-42S Calculator Simulator is an Open Source recreation of the HP-42S Scientific Programmable Calculator and HP-82240 Printer. Plus42 is also available.

Qalculate! is a powerful math software with user-friendly tools like currency conversion and percent calculation. Portable version is also available.

Qalculate! Portable is a versatile, cross-platform calculator for desktops that is Open Source. Installer is also available.

Alternate Calculator is a freeware calculator that has different numbers and currency conversions.

Alternate Math Solver is a freeware tool to solve equations that contain a variable X towards this variable. The resulting equation will look like X=...

Graphing Calculator 3D is an advanced high-quality 3D graphing calculator that enables you to plot any number of mathematical equations or coordinates.

Calcpad is a free and flexible programmable mathematical and engineering calculator that includes an HTML report generator.

Calculor enables quick computations with instantaneous answers as you type.

Euler Math Toolbox (EMT) is a powerful Open Source math program combining numerical and symbolic tools.

WBigCalc is an advanced scientific calculator designed for users who require exceptionally high levels of precision in their calculations.

rpCalc is a feature-rich Open Source desktop calculator.

CCalc gives you an efficient Command Line calculator that offers a wide range of functions, including arithmetic operations, algebraic calculations, and Boolean functions.

ConvertAll is another unit converter but with a twist; the units you convert don't need to make sense to anyone else.

fx-Calc is an advanced calculator that allows straightforward and intuitive handling of complex mathematical tasks.

RedCrab is a calculator with a full-screen editor that can perform precise technical, scientific and financial calculations.

CalcPad is a portable smart notepad that calculates answers based on what is typed in.

Proportional Calculator allows you to scale an object proportionally, given the height and width of an object and one or more limiting factors ( square footage, max-height, or max-width).

cCalc is a portable, Open Source binary calculator capable of using x/86 instructions.

Windows Calculator provides you with a powerful but simple calculator.

Sicyon provides you with an all-in-one scientific calculator usable for students as well as developers, researchers, and even professors.

Learn to solve equations step-by-step while gaining a better understanding of fundamental concepts in pre-algebra, algebra, trigonometry, physics, chemistry, and calculus.

Smart Math Calculator easily allows you to do all your calculations in one convenient place.

CalcTape provides you with a usable real-world calculator that allows for easy notations and corrections to any of your calculations.

Kalkules is a universal scientific freeware calculator with some nontraditional functions, useful for anyone but particularly for high school and university students.