ODOP:Spring

Design faster with an industry-specific toolset for mechanical engineering, including 700,000+ intelligent parts and features. Isolate and restore layer groups and specify linetypes and lineweights. Update geometry automatically when changes occur. Minimize manual redraws. Produce accurate drawings with standard components. Efficiently analyze designs, including shaft, spring, belt, chain, and cam generators. Detail native Inventor part and assembly models. Use intelligent drafting tools made for mechanical design. Custom content library and publishing. Create and save custom content. Preview fillet, chamfer, and offset commands. Take the power of AutoCAD® wherever you go. Smart mechanical engineering dimensions. Create dimensions using abbreviated dialog boxes. 2D DWG with a view of the standards tab on the open options panel. Support for international drafting standards. Deliver standards-based design documentation.

FreeCAD is an open-source parametric 3D modeler made primarily to design real-life objects of any size. Parametric modeling allows you to easily modify your design by going back into your model history and changing its parameters. FreeCAD allows you to sketch geometry constrained 2D shapes and use them as a base to build other objects. It contains many components to adjust dimensions or extract design details from 3D models to create high quality production ready drawings. FreeCAD is a multiplatfom (Windows, Mac and Linux), highly customizable and extensible software. It reads and writes to many open file formats such as STEP, IGES, STL, SVG, DXF, OBJ, IFC, DAE and many others, making it possible to seamlessly integrate it into your workflow. FreeCAD is designed to fit a wide range of uses including product design, mechanical engineering and architecture. Whether you are a hobbyist, a programmer, an experienced CAD user, a student or a teacher, you will feel right at home with FreeCAD.