GeoGebra

            
            Dynamic mathematics software for education

GeoGebra is a dynamic geometry program. You can do constructions with points,vectors, segments, lines, conic sections as well as functions and changethem dynamically afterwards. On the other hand, equations and coordinatescan be entered directly.

Support for many geometric constructions is provided, as well as supportfor many calculus-based tools (derivatives, osculating circle, ...).

GeoGebra files can be exported in many different formats, or as interactiveapplets for web pages.