Rule of 3 Calculator - Apply the mathematical Rule of Three in an easier, faster and more practical way!
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 .
Calculator OSX App - Real Time.
Precise Calculator - Free programmable scientific calculator for Windows; solve math problems, algebra, statistics examples and tutorial
Real Time Calculator - A practical browser calculator that outputs results in real time!
PCalc - PCalc is the powerful choice for scientists, engineers, students, programmers, or indeed anybody...