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Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.
GeoGebra CAS Calculator - Free online algebra calculator from GeoGebra: solve equations, expand and factor expressions, find derivatives and integrals
NumWorks - The graphing calculator that makes learning math easier.
GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.
SpeQ Mathematics - SpeQ is a small, extensive mathematics program with a simple, intuitive interface.
Dr. Geo - Dr. Geo, a software to design & manipulate interactive geometric sketches.