FreeCAD

FreeCAD is a feature-rich yet lightweight 3D CAD modeler that combines professional-grade tools with remarkable portability. It offers a wide array of configuration parameters and workbenches for drafting, mesh design, and path planning for CNC. The parametric modeling core ensures designs are easily adjustable by changing parameters. As a free and open-source solution, it lowers the barrier to entry for students and makers while providing the depth needed for engineering professionals, all within a single, portable application.