RealCalc Scientific Calculator VS Rule of 3 Calculator

SpeedCrunch - SpeedCrunch. SpeedCrunch is a high-precision scientific calculator featuring a fast, keyboard-driven user interface. It is free and open-source software, licensed under the GPL. Download Documentation Donate .

SpeQ Mathematics - SpeQ is a small, extensive mathematics program with a simple, intuitive interface.

Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.

NumWorks - The graphing calculator that makes learning math easier.

Numi App - Numi is a beautiful text calculator for Mac.

Soulver - Soulver is a software application that functions as a calculator that allows you type a continuous stream of information rather than having to input data into multiple cells.