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 .
Numi App - Numi is a beautiful text calculator for Mac.
Precise Calculator - Free programmable scientific calculator for Windows; solve math problems, algebra, statistics examples and tutorial
galculator - galculator is an open source scientific calculator with a modern GUI and a wide range of operation modes. It supports algebraic, reverse polish (RPN) and paper mode notations.
PCalc - PCalc is the powerful choice for scientists, engineers, students, programmers, or indeed anybody...
GlassCalc - GlassCalc is a free Windows calculator designed for quick input via keyboard.