WGCalculator is a great replacement for the built-in Windows calculator. Basic features include:
changeable appearance by applying any skin you like, free skin updates, skins can be easily downloaded and installed from within the program with just a few mouse clicks, adjustable window transparency, program minimizes to the Windows system tray, Hotkey controls minimizing and restoring program window, clipboard support.

Ultimate Advantage? is a Unit Aware? calculator that lets you work with feet-inch-fraction dimensional values and includes advanced math functions, automatic solvers, and much more. Unit Aware? means that you can effortlessly compute with units (not just convert). It also has great options like algebraic and RPN entry, customizable buttons for unit entry, and display precision options. Available for both Windows and Pocket PC.

Time calculator and spreadsheet, graph, saving and export to csv, MySQL and html.
Serial port access, auto logging. No timer limit, precision of 1, 10 or 100 milliseconds, software calibration.
Simple entering of time values, auto correct function, conversion between time format and different units from milliseconds up to years.
The distribution includes a metronome and a little alarm clock.

The value suffixes is one of the most interesting features of The Calculator.
So, if you need to enter a 4 000 000, just type 4M. That's all! Need to calculate the cosine of 20 degrees? (By default, The Calculator works with radians) Type cos(20g) and get the result.

Solution Solver 2.0 is a program designed for chemists, biologists and other scientific professionals. Its purpose is to make your routine lab calculations quick and reliable.Spend your time accomplishing your primary work and let Solution Solver assist you. Solution Solver can perform dilution equations, conversions, solution problems, radioactive decay equations, and much more!

Scientific Advantage? is a Unit Aware? calculator that lets you work with feet-inch-fraction dimensional values and includes advanced math functions, automatic solvers, and much more. Unit Aware? means that you can effortlessly compute with units (not just convert). It also has great options like algebraic and RPN entry, customizable buttons for unit entry, and display precision options. Available for both Windows and Pocket PCs.

PG Calculator is a powerfull scientific calculator and an excellent replacement for standard calculator. It ofers full customizable user inteface and looks like real calculator on user desktop.
PG Calculator works in Algebraic and RPN modes. It works with real and complex numbers, units of measure, allows vectors manipulations. Up to 120 recognized units of measure, built-in unit converter. Time Value of Money Solver, commonly used constatants.

Numero is a calculator program that does the order of operations, so you can type in the whole expression at once instead of just one number at a time. It has about everything that you would expect to see on a scientific calculator. Also, in addition to the text box that you enter the expression into, Numero has a text box that displays all of the expressions and answers that you have already calculated. The interface is also customizable.

HEXelon MAX - free scientific calculator, converter units, currency.

ESBCalc is a Freeware Windows Scientific Calculator with Infix Notation, Brackets, Scientific Functions, Memory, Optional Paper Trail, Result History List, Customisation of the Colours/Fonts used, Customisation of the Hints, and more. Functions include Trigonometric, Hyperbolic, Logarithmic - Base 10, Base 2 and Natural - and many more. Looks best with Windows XP in 800x600 (or better) and 32-bit colour. Now with improved Large Font Support.

The Dovada student calculator is ideal for use in the school, home, office or engineering and scientific research centers, anywhere scientific calculator or graphic calculator information is continually used or required,
The Dovada student calculator has hundreds of science, astronomy, physics data and mathematical formulae built in and can be easily accessed and used in calculations. No longer do you have to search the text books for that common formula or data.

DesktopCalc is an enhanced, easy-to-use and powerful scientific calculator with an expression editor, printing operation, result history list and integrated help. Desktop calculator gives students, teachers, scientists and engineers the power to find values for even the most complex equation set.

Scientific calculator and function plotter. Logic operators. 10 constant memories. Automatic bracket completion. Three angle units. Square and cubic roots.Trig. functions. Hyperbolic functions. Logarithm. Numerical integration. Combinations and permutations.
Plot functions: linear and logarithmic plots. Parametric plots. Multiple plots in one window. Zoom function. Printing function. Export to clipboard. Function value at mouse position.

Animated weather radar & satellite, local temperature in tray, local weather, internet clock sync, sun and moon rise and set times, animated moon phases, planet positions in the sky, eclipses, equinox/solstice, meteors, month calendar with moon phase icons, full year calendar, 27 holidays, map, aerial photo, topographic map, start & end daylight savings, dictionary, thesaurus, calculator, unique graph of sunrise and set times for entire year.

Powerful Calculator for Finance, Science, Math, Stats, Unit Conversions, Date and Time Calculations, Numeric Bases, Bit-Level Operations, Complex Numbers, Random Numbers, Prime Numbers, Fractions, Trigonometry, NIST Scientific Constants. Quick Popup Access. Selectable Keypads, Button Size, Font, Display Format. Editable Work Area: Calculate, Annotate Your Work, Change and Repeat Your Calculations, Save to File and Restore. Detailed Help File.

CalculatorX is an enhanced expression calculator. It can evaluate an expression for one time. You can use Arithmetic, Logic, Bitwise and Relation operations in your expression. And many system constants and built-in functions can also be used in the expression. CalculatorX even supports the custom variables, custom functions and note-line. You can use Binary, Octal, Decimal and HEXadecimal numbers in one expression to evaluate as well.

It is the compact, handy and "smart" calculator. It is created for replacement of built-in Windows calculator. Has the beautiful adjusted user interface. With the help of semi-automatic monitoring the clipboard will save a lot of your time.
Features:
1) 40 built-in functions
2) Syntax highlight of math expressions
3) Clipboard smart functionality
4) Four numerical systems for entering and printing numbers

HiDigit is a new calculating software with extended capabilities. This is an essential application for math, algebra, calculus, geometry, physics and engineering students. The main advantage of the software is a simple input format even for the most complicated formulas. For example, you can enter 10pi instead of "10*pi". This scientific calculator works with complex numbers, keeps record of previous actions; both mouse and keyboard can be used.

ESBCalc Pro is an Enhanced Windows Scientific Calculator with Infix Processing, Exponential Notation, Brackets, Scientific Functions, Memory, Optional Paper Trail, Printing, Result History List, Integrated Help and more. Functions include Trigonometric, Hyperbolic, Logarithmic - Base 10, Base 2, Natural - Random Number and many more. Also includes expression editing and custom constants. Register only once for life of product.

A+ Calc is a scientific calculator with a multi-line edit display that shows all calculations and allows editing and recalculating equations. A+ Calc includes hexadecimal, statistics, and unit conversion tools, and calculation save and load capability. Trial use only applies to premium features, most features are available free of charge. View, edit and recalculate with new values and/or operators. Simple uncluttered user interface.