VariCAD

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.

TurboCAD® 2021 Platinum is a professional 2D Drafting and 3D Solid Modeling CAD Solution for engineers, architects, manufacturers and other design professionals. It comes fully equipped with a powerful drafting palette, ACIS® solid modeling, premium photorealistic rendering, advanced architectural and mechanical tool sets, AutoCAD®-like 2D drafting interface options, and extensive file support. TurboCAD® 2021 Platinum delivers a robust collection of professional 2D/3D CAD tools to design, modify, present, and document in an integrated fashion. It includes advanced mechanical design and modification tools, a powerful drafting palette, 2D geometric and dimensional constraints, and an ACIS® solid modeling engine. It includes a customizable Ribbon Interface with 4K monitor support to optimize productivity and readability on higher resolution displays.