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Giac/Xcas - Free computer algebra system
Console Calculator - Console Calculator is a powerful calculator with a simple console interface.
GeoGebra CAS Calculator - Free online algebra calculator from GeoGebra: solve equations, expand and factor expressions, find derivatives and integrals
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 .
Geometry Pad - Geometry Pad is a dynamic geometry application for iPad and Android tablets.
Calculator by Xlythe - Calculator is a simple 4 function calculator.