They can be functional features or manufacturing features. It enables to study the product more efficiently than a geometrical model based on a mesh or on free form surfaces.This paper proposes approaches and methodologies for using knowledge to rebuild CAD model to the best closer to the original CAD model that could have been obtained by the original designer. Such models can provide important possibilities for Reverse Engineering. The geometry of a given product is the consequence of a complete process, it is important, considering Reverse Engineering activities, to try to recover any evidence of its past life (including socio-economical aspects, the design intents of the former designer, its different uses…) from its geometry in order to produce a good quality 3D model. Unfortunately, all those toolboxes present a lack of geometry analysis tools. object as a set of functions (protrusion, revolution, sweep…), they enable to add colours and textures, and they enable realistic kinematical animation and many other things. Those software’s enable to rebuild the geometry of a technical. Moreover, some of them provide segmentation algorithms, sketchers and/or many other facilities rebuilding tools in order to help to recover the original surface. In Reverse Engineering, commercial solutions such as Geomagic™ or RapidForm™ or CAD software such as CATIA™ provide very efficient toolboxes that enable to rebuild geometry. The analyses were carried out by checking the functionalities of the freeware agains t the requirements of the course and by collecting information from mini-courses applied to the students. Thus, the objec tive of the present work is to analyze the feasibility of a pplying freeware for the teaching and learning of Engineeri ng Design Graphics. From t he viewpoint of the students, the use of freeware inst ead of commercial CAD tools, whose access is limited due t o the cost, may mean the possibility of doing the home wo rks or practicing the projects at home. Also, due to the cost, the availability of the CAD tools to the students is relatively limited. With constant improvement and updating, the potential of these freeware for the educational use is increa sing quickly. Recently, ther e are many freeware for graphics use, such 2D vector drawing and 3D modeler applications as well as CAD software. Within this context, there is a demand for the CAD software in the Engineering courses. In the modern education of Engineering Design Graphics, the use of CAD technology is essential in learning of theoretical concepts, such as Projectiv e Geometry and Geometrical Modeling, for the development of spatial abilities and the mastering of the engineering graphics communication and design tool.
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