FreeCAD

Open-source 3D CAD modeler aimed at mechanical engineering.

Probably the best known design and 2D/3D modeling general purpose application is AutoCAD. But if your specialty is mechanical engineering and you need a free solution to develop your projects, you will really like FreeCAD, very similar to programs like Catia, SolidWorks and Solid Edge.

  FreeCAD is an open source application focused at 3D modeling and to the design of products, based on parametric modeling. It is a perfect application for engineering and architecture students, as well as freelancers of the field.

  The main features of FreeCAD are:
- Complete application based on GUI.
- Possibility to work from command line.
- Possibility to import as Python module.
- Application composed be means of modules.
- Possibility to solve the projects in a format based on ZIP, capable of storing different kinds of information.
- Option to use macros.

  The best free solution for design and 3 modeling, is FreeCAD.