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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 .
NumWorks - The graphing calculator that makes learning math easier.
Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.
PCalc - PCalc is the powerful choice for scientists, engineers, students, programmers, or indeed anybody...
Numi App - Numi is a beautiful text calculator for Mac.
Rule of 3 Calculator - Apply the mathematical Rule of Three in an easier, faster and more practical way!