Calculator.NET
Calculator. NET is an enhanced version of the standard calculator in Microsoft Windows. It uses RPN (Reverse Polish Notation), which is used by many pocket calculators, e. g. from HP. If you have used a HP 11/28/32/42/48, or any other RPN calculator, you will feel right at home. ... Some of the enhancements included: RPN, extended function set, and customizable user interface. ... This program is completely free.
http://www.speech.kth.se/calculator/dist/Setup.msi - 437b - Download - Screenshot

PG Calculator (Second Edition)
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 integer, real and complex numbers,... PG Calculator contains list of commonly used mathematic, physic and chemical constants and supports user-defined variables. ... PG Calculator enables numbers inputing in binary, octal, hexadecimal and exponential formats.
http://www.pgcalc.net/setup-pgcalc-se-2.2-9.win32.exe - 2Mb - Download - Screenshot

PalmaryCalc
PalmaryCalc is a calculator with a user-friendly interface. It is all in one: from a simple calculator to a scientific, conversion functions (from cooking to astronomical), credit, base number conversions between binary, octal, decimal, and hexadecimal; 32-bit, 16-bit, and 8-bit integer math... The variety of input methods (including RPN) enables you to perform almost all operations you need.
http://www.palmarysoft.com/products/calc/PalmaryCalc_v101.zip - 625Kb - Download - Screenshot

Judy's TenKey
Judy's TenKey, winner of the Ziff Davis "Desktop Accessory of the Year," enables you to work faster and more reliably. Once you can see (and reuse! ) the numbers in your calculations, you will never return to the default Windows calculator. If you're still using an old-fashioned desktop... FLEXIBILITY: Judy's TenKey can process numbers like a scientific calculator (RPN), an adding machine, or a normal calculator. ... A calculator is something you use every day ... ... why not use the best? ... 95 at http://www.
http://www.JudysApps.com/10Key.zip - 334Kb - Download - Screenshot

RPN Engineering Calculator
This RPN calculator offers 250 solutions with six unique keypads. It has a complete help system with individual tips for all but the most ordinary functions and a Tip of the Day feature for new users. You can select fixed, scientific or engineering notation and degrees, radians, or grads as... ), and some unique to itself: a simple math teaching aid for kids, Wind Chill calculator, and more. ... Briefly, unique to the 6 keypads are: Standard; contains several of the functions found on a normal scientific calculator (log, ln, N!
http://www.j-a-associates.com/DnLoads/rpn.zip - 1Mb - Download - Screenshot

Basic Advantage Combo
Advantage? is a Unit Aware? calculator that lets you work with feet-inch-fraction dimensional values. Unit Aware? means that you can effortlessly compute with units (not just convert). Advantage also includes options to make the calculator work the way you want it to such as: algebraic and RPN... , 70 lb/ft3 x 5 yd3 = 9450 lb) KEYPADS AND ENTRY LOGIC - Algebraic and RPN entry modes (user selectable) - Allows entry of feet-inches-fractions using the decimal key. ... ), including both English/Imperial and SI/Metric units - Computes directly with dimensional values (e.
http://www.advantagecalculators.co...load/BasicAdvantageComboSetup.msi - 1Mb - Download - Screenshot

Ultimate Advantage Calculator
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. ... , 70 lb/ft3 x 5 yd3 = 9450 lb) KEYPADS AND ENTRY LOGIC - Algebraic and RPN entry modes (user selectable) - Allows entry of feet-inches-fractions using the decimal key.
http://www.advantagecalculators.co...oad/UltimateAdvantagePPCSetup.msi - 1Mb - Download - Screenshot

Scientific Advantage Calculator
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. ... , 70 lb/ft3 x 5 yd3 = 9450 lb) KEYPADS AND ENTRY LOGIC - Algebraic and RPN entry modes (user selectable) - Allows entry of feet-inches-fractions using the decimal key.
http://www.advantagecalculators.co...d/ScientificAdvantagePPCSetup.msi - 1Mb - Download - Screenshot

Construction Advantage Calculator
The Ultimate Builder's Construction Calculator for your Desktop, Notebook, and PocketPC. Here are just a few of the features that make Construction Advantage the best. Keypads and Entry Logic Patented 0-15 keyboard exclusive only on the Jobber User selectable choice of Algebraic or RPN entry... , 70 lb/ft3 x 5 yd3 = 9450 lb) Automatic Solvers Circle Circle - Segmented Fall Circle - Segmented Rise Cone Cube Cylinder Rafters Rectangular Box Sphere Stairs Triangle - Oblique Triangle - Right Triangle - Segmented Fall Triangle - Segmented Rise Additional Features Estimator for easily...
http://www.formativesoftware.com/D...ConstructionAdvantagePPCSetup.msi - 1Mb - Download - Screenshot

vCalc
vCalc is a keyboard driven scientific calcualtor, that works using the RPN notation common in well known scientific calculators. It supports a complete set of math, binary and statistical operations. * Keyboard driven user interface * Four basic operations on integer and floating point numbers...
http://www.icegiant.com/downloads/vcalc.exe - 804Kb - Download - Screenshot