FreeCAD - An open-source parametric 3D modeler
Autodesk Fusion 360 - Integrated CAD, CAM, and CAE featuring collaborative editing and cloud-based computation.
SketchUp - 3D for Everyone
ANSYS SpaceClaim - SpaceClaim 3D Modeling Software Solves Geometry Problems Fast.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
Altair Inspire - Altair Inspire enables design engineers, product designers, and architects to create and investigate structurally efficient concepts quickly and easily.