CGAL provides now basic viewers, i.e. global functions allowing to visualize in 3D some CGAL data-structures. These small viewers are very usefull in order to visualize the result of an algorithm, and can help to debug some code. For now, 5 basic viewers exist, for Polyhedron, Surface_mesh, Triangulation_2, Triangulation_3 and Linear_cell_complex. The goal of this project is to develop more basic viewers for other CGAL data-structures.