FreeCAD

About

FreeCAD is an open-source parametric 3D modeler designed primarily for creating real-life objects of any size. Because it is parametric, you can change a design by returning to its model history and adjusting its parameters. It also lets you sketch geometry-constrained 2D shapes and use them as a base for 3D objects, and it can extract design details from 3D models to produce production-ready drawings. It runs on Windows, Mac, and Linux, and reads and writes many open file formats such as STEP, IGES, STL, SVG, DXF, OBJ, IFC, and DAE.

FreeCAD is aimed at a wide range of users, including hobbyists, students, teachers, programmers, and experienced CAD users, and is used for product design, mechanical engineering, and architecture. The website mentions tools for Finite Element Analysis, experimental CFD, BIM, Geodata, CAM/CNC, and robot simulation as well. It is free to use with no sign-up, paywall, or licensing fees.