GeoGebra - GeoGebra is free and multi-platform dynamic mathematics software for learning and teaching.
GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.
Cinderella - Cinderella is the interactive geometry software and a universal tool for visualization and...
Giac/Xcas - Free computer algebra system
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.