MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
FreeCAD - An open-source parametric 3D modeler
SimScale - SimScale makes high-fidelity engineering simulation truly accessible. From anywhere. At any scale. In the cloud.
SketchUp - 3D for Everyone
Autodesk Fusion 360 - Integrated CAD, CAM, and CAE featuring collaborative editing and cloud-based computation.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.