Excalibur

Excalibur for Windows 32-bit version is a freeware full featured RPN-only calculator.

19 Alternatives To Excalibur

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Airtable

Airtable works like a spreadsheet but gives you the power of a database to organise anything. Airtable can store information in a spreadsheet that’s visually appealing and easy-to-use, but it’s also powerful enough to act as a database that businesses can use for customer-relationship management (CRM), task management, project planning, and tracking inventory.

Calculator by Xlythe

Calculator is a simple 4 function calculator.
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Gnome calculator

Calculator for the GNOME Desktop Environment, formerly known as gcalc (and gcalctool CLI).
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Google Sheets + MonkeyLearn

Power up your Google Sheets with text analysis
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MyScript Calculator

Perform mathematical operations naturally using your handwriting.
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PCalc

PCalc is the powerful choice for scientists, engineers, students, programmers, or indeed anybody…

Reactivepad

Documents made smart with textually narrated calculations 📝📊
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SimpleCalc

A calculator written in C#.NET 3.5 that aims to be simple and usable.

TTCalc

TTCalc is an open source bignum mathematical calculator.
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TotalSheets

A powerful spreadsheet app in your browser 📊

handyCalc

Solve things in your hand.