A simple yet powerful calculator that ships with Windows
Calc: arbitrary precision C-like arithmetic & calculator
Calculator++
Engineering Calculator and Unit Converter
QxCalc, a scriptable calculator
Precision Trigonometry: Advanced Calculator for Complex Math
Evaluate math expressions from command line or in interactive session.
Programmable Calculator (IP functions, create user functions)
Command-line calculator and libray.
A calculator like programming language
Mathematical expression parser and evaluator for .NET
Arithmetic and calculus with decimal numbers of arbitrary precision.
The Fourth Edition of STEMCalc and the biggest one yet!
Editor, Calculator, Image Viewer and Color Picker
Simple tool for numerical calculation
A simple calculator.
Interval Calculator for Engineer
BODMAS Calculator Capable of use of brackets in calculations
Basic Calculator for mathematical operation
Provides useful mathematical tools which make your work much easier.
Reor is a winsome calculator with loads of functions, by Ajay Menon.
Powerful Calculus Environment and Matrices Handling Engine