GeoGebra CAS Calculator - Free online algebra calculator from GeoGebra: solve equations, expand and factor expressions, find derivatives and integrals
C.a.R. - C.a.R. (Compass and Ruler) is an interactive geometry program for simulating compass-and-ruler...
Dr. Geo - Dr. Geo, a software to design & manipulate interactive geometric sketches.
Cabri - Cabrilog presents its maths software: Cabri 3D, Cabri II Plus and Cabri Jr. Maths softwares
Giac/Xcas - Free computer algebra system
SciDaVis - SciDAVis is a free application for Scientific Data Analysis and Visualization.