AddsUp
Windows calculator software featuring real-time recalculations, unlimited memories, intuitive references, quick printing support, and the ability to add columns, descriptions, dates, and notes.

The Calculator Home Page
Collection of resources related to calculators for multiple platforms, for various applications.

DreamCalc Scientific Calculator
Scientific graphing calculator for Windows offering a full range of mathematical, scientific, statistical, and financial functions.

FNA
Multifunction calculator and conversion tool. Offers four modes of operation that enable the computation of complex statistical, trigonometric, and base-n conversion routines.

Fornux PowerCalc-GX
Scientific calculator and fast graphing utility with advanced logical, scientific, statistical, vector, and linear algebra operations.

Fung-Calc
Advanced open source graphing calculator for Linux. Plots several types of 2D and 3D graphs.

GCalc
Online graphing calculator designed to provide an easy-to-use set of functionalities for algebra, pre-calculus, and calculus.

Math.net
Offers a site of mathematics with a free math problem solver, calculators, articles, exercises, worksheets and more.

PG Calculator
Skinnable scientific calculator that works in algebraic and RPN mode. Recognizes real and complex numbers and performs simple vector manipulations.

PractiCalc
Calculator and conversion tool that works on all Windows platforms. Generates real-time calculations while typing.

sCal & sCal2
Scientific and engineering calculator offering several customizable unit conversions and procedures.

Sicyon
Freeware all-in-one scientific calculator capable of computing or analyzing expressions or program functions. Handles physical or chemical formulas and tables of constants.

Ultimate Date Calculator
Calculator program for business, government, and professional use. Downloadable trial and user manual provided.