NumberMate
- Arithmetic and scientific calculator, adding machine, and time calculator that records and documents calculations on multiple tapes that can be edited.
- http://www.numbermate.com/

CLK-Calculator
- A calculator solution for school, high school, university and engineers. The handling is especially simple and clear, with choice of preferred input mode algebraic or RPN. Unit conversions, matrix calculations, complex numbers, vectors handling and functi
- http://www.clk-calculator.de/

The Mother of All Calculators
- Kalkulator is a powerful yet simple to use calculator and numerical Swiss army knife for Windows (95..XP), with features making it especially suitable for scientific and engineering users, including students of these disciplines.
- http://www.wrotniak.net/works/kalkulator/index.html

Americalculator
- Alternative to the standard Windows calculator, save calculation lists as text files, many other features, simple yet powerful tool no computer need be without. Optional large size for easy reading.
- http://americalculator.com

HiDigit
- Scientific calculator with extended capabilities for Windows.
- http://www.binarythings.com/hidigit/

AnalyticMath
- AnalyticMath is a platform independent (Windows, Linux, etc.) mathematics program with a powerful editor and many integrated features that will allow you to expand and/or simplify algebraic expressions quickly and easily.
- http://www.analyticmath.com

CalculatorX - Enhanced Expression Calculator
- CalculatorX is an enhanced expression calculator. It supports Arithmetic, Logic, Bitwise and Relation operations. Constants and built-in functions can also be used in it.
- http://www.xoyosoft.com/cx/index.htm

Machinist's Calculator
- Calculator for common machine shop math problems.
- http://www.machinist-calculator.com/

Calc 3D Pro
- Calculator for vectors, matrices, complex numbers, coordinates, function plotting and intersections. Cartesian, spherical and cylindrical coordinates can be transformed into each other. Also integrated: editor, arithmetic trainer, calendar, and help file.
- http://www.calc3d.com/

System Essentials - CalcPac
- Software that emulates popular handheld calculators like the HP-12C, TI-36X and others. CalcPac contain hundreds of business and financial functions that can solve the most difficult problems.
- http://www.systemessentials.com/

Virtual Calc
- A calculator that supports unconstrained bases and infinite precision. Replaces limited calculator in Windows.
- http://www.edepot.com/win95.html

Moffsoft Calculator
- A replacement for the existing Windows calculator, features include a history tape, sizeable display, tray icon and visible memory value.
- http://www.moffsoft.com/

GraphiCal
- A configurable graphics calculator, which displays graphical representations of expressions and formulas, and lets you visualize parameter changes as video clips. Requires VB6 and MFC42 Runtime files. [Win95/98/Me/NT/2000]
- http://www.wilhelm-kurz-software.de/graphical/graphical.htm

GraphCalc
- A calculator to use for a variety of purposes, including the production of 2D, and 3D Euclidean, and Polar graphs.
- http://www.graphcalc.com/

Expression Calculator
- Performs over a hundred simple, and complex calculations, with the ability to make several calculations simultaneously. Functions range from simple trigonometry, to Gaussian integrals, through 2D plots. [Win95/98/Me/NT/2000]
- http://excalc.vestris.com/

BAC Computer Software
- Calculator that performs the basic arithmetic operations on fractions and then at the press of a button gives you a detailed explanation of how the computation was done.
- http://www.bacsoftware.co.uk/fcalc1/

Advantix Calculator
- Integrated mathematical tool that can compute mathematical expressions involving complex numbers, polynomials, rational functions, vectors, and matrices.
- http://www.mathedusoft.com/