A very interesting page that displays animations that are used to demonstrate concepts and study properties in the plane with a lot of problems and proposed geometric resolved.

It devotes a section to the geometry of space with the construction of polyhedral that revolves in space or exploring the duality between the bucket and the octahedron from successive truncation.

It's to make geometry activities in an interactive way, with a program GEUP. It is a useful tool for any level. It includes activities that help to define, evaluate and represent functions, check parallelism, perpendicularity, alignment, equidistance, define conical. it has a new version of the program, which can be accessed for evaluation.