DreamCalc Scientific Calculator
DreamCalc is the smarter alternative to a hand-held Scientific Calculator for your PC or laptop! You'll get the intuitive feel and productivity of using a professional hand-held, but one which adapts to your way of working. Select from Reverse Polish Notation or two styles of algebraic input,... Because it is software, it allows you to exchange your results and lists with your other applications. ... DreamCalc also offers you a full range of scientific functions, statistics, complex numbers, base-n logic, unit conversions, built-in constants and a powerful polynomial solver.
http://www.dreamcalc.com/downloads/dc3s_setup.exe - 3Mb - Download - Screenshot

DreamCalc Graphing Calculator
DreamCalc is the smarter alternative to a hand-held Graphing Calculator for your PC or laptop! You'll get the intuitive feel and productivity of using a professional hand-held, but one which adapts to your way of working. With DreamCalc, you'll be able to graph functions and plot list data more... Select from Reverse Polish Notation or two styles of algebraic input, and with the optional ability to run in your Windows system tray--DreamCalc will always be there whenever you need to reach for a calculator.
http://www.dreamcalc.com/downloads/dc3g_setup.exe - 3Mb - Download - Screenshot

EngCalcLite(HVAC) - Palm Calculator
Momentous HVAC Calculator. Scientific Evaluator - Superlative collection of Operators and instant reference to recent calculations. Memory functions etc. A must have for Engineers. This Palm software program empowers you with instant references and solutions of frequently encountered... Humidity Ratio,Moist Air Density,Water Vapor Density,Mixture Density,Relative Humidity,Moist Air Enthalpy. ... This means you will have more time to analyze your information and make better informed decisions, thus helping your company maintain a competitive edge.
http://www.3grtech.com/EngCalcLitePalm_HVAC.zip - 904Kb - Download - Screenshot

EngCalcLite(HVAC) - PocketPC Calculator
Momentous HVAC Calculator. Scientific Evaluator - Superlative collection of Operators and instant reference to recent calculations. Memory functions etc. A must have for Engineers. This PocketPC software program empowers you with instant references and solutions of frequently encountered... Humidity Ratio,Moist Air Density,Water Vapor Density,Mixture Density,Relative Humidity,Moist Air Enthalpy. ... This means you will have more time to analyze your information and make better informed decisions, thus helping your company maintain a competitive edge.
http://www.3grtech.com/EngCalcLitePPC_HVAC.zip - 3Mb - Download - Screenshot

Kalkulator
The Mother of all Calculators, a Swiss Army knife for scientists and engineers. Perhaps the most capable scientific/engineering calculator for Windows. On one hand, this is a calculator: evaluates expressions with more than 100 functions (trig/inverse, log/exp, statisical distributions, Euler,... Kalkulator has been evolving on various OS platforms for the last 15 years, being refined and polished through all this time, and its author has more than 25 years of active experience in numerical methods and software development.
http://www.wrotniak.net/works/kalkulator/_zip/kalkulator-inst.exe - 956Kb - Download - Screenshot

DreamCalc Financial Calculator (Pro)
DreamCalc Professional is the smarter alternative to a hand-held Financial Calculator for your PC or laptop! You'll get the intuitive feel and productivity of using a professional hand-held, but one which adapts to your way of working. With DreamCalc, you'll be able to graph functions and plot... Because it is software, it allows you to exchange your results, graphs and lists with your other applications. ... Select from Reverse Polish Notation or two styles of algebraic input, and with the optional ability to run in your Windows system tray--DreamCalc will always be there whenever you...
http://www.dreamcalc.com/downloads/dc3p_setup.exe - 3Mb - Download - Screenshot

EngCalc(Financial) - Palm Calculator
Six most commonly used Financial calculators. Unit Converter.. Most comprehensive collection of units. 100+ Categories, 1000+ units, 10000+ Conversion. Constant values. Swap conversions. Can add new units and property groups. Easy to use utility, no need to program before using. ... Scientific Evaluator.. ... This Palm software program empowers you with instant references and solutions of frequently encountered calculation at your finger tips. ... This means you will have more time to analyze your information and make better informed decisions, thus helping your company maintain a...
http://www.3grtech.com/EngCalcPalm_EF.zip - 1Mb - Download - Screenshot

EngCalc(Financial) - PocketPC Calculator
Six most commonly used Financial calculators. Unit Converter.. Most comprehensive collection of units. 100+ Categories, 1000+ units, 10000+ Conversion. Constant values. Swap conversions. Can add new units and property groups. Easy to use utility, no need to program before using. ... Scientific Evaluator.. ... This PocketPC software program empowers you with instant references and solutions of frequently encountered calculation at your finger tips. ... This means you will have more time to analyze your information and make better informed decisions, thus helping your company maintain a...
http://www.3grtech.com/EngCalcPPC_EF.zip - 3Mb - Download - Screenshot

Calcute
Calcute is a Free and Compact yet Capable Tape Calculator. More advanced than standard calculators, it is actually an expression evaluator that lets you process arbitrarily complex numeric expressions like: -ln(1+2) * 3% + sin(4 5/6)^7. As shown in this example, you can even enter an exact... Many scientific functions are supported: logarithms and exponents, trigonometric and hyperbolic functions, normal and inverse. ... Arithmetic software routines are used to prevent common rounding errors associated with computer hardware.
http://calcute.com/calcute_setup.exe - 137Kb - Download - Screenshot

EngCalc(Heat and Mass Transfer) - Palm Calculator
Momentous Heat and Mass Transfer Calculator. Scientific Evaluator - Superlative collection of Operators and instant reference to recent calculations. Memory functions etc. A must have for Engineering professionals and students. This Palm software program empowers you with instant references and... Entropy Exchange in HeatXfer,Heat Conduction in Hollow Cylinder,Gray-body Radiation,Heat conduction in hollow sphere,Convection-Conduction Network,Critical Radius of Insulation,Black Body Radiation,Contact Heat Xfer Coeff,Film Temperature,Local FlatPlate Nusselt # (laminar),Avg FlatPlate Nusselt...
http://www.3grtech.com/EngCalcPalm_HaM.zip - 1Mb - Download - Screenshot