GeoGebra [http://www.geogebra.org/] is a free and multi-platform dynamic mathematics software for all levels of education that joins geometry, algebra, tables, graphing, statistics and calculus in one easy-to-use package.
Its main features are:
Allows embedding easily GeoGebra activities in some Moodle course.
Facilitates students tracing because it stores the score, date, duration and construction of each of the attempts made by the users.
Students can save the state of the activities to continue them later.
