GeoGebra - GeoGebra is free and multi-platform dynamic mathematics software for learning and teaching.
Giac/Xcas - Free computer algebra system
C.a.R. - C.a.R. (Compass and Ruler) is an interactive geometry program for simulating compass-and-ruler...
GeoGebra CAS Calculator - Free online algebra calculator from GeoGebra: solve equations, expand and factor expressions, find derivatives and integrals
Cabri - Cabrilog presents its maths software: Cabri 3D, Cabri II Plus and Cabri Jr. Maths softwares
Geometry Pad - Geometry Pad is a dynamic geometry application for iPad and Android tablets.