Blender - Blender is the open source, cross platform suite of tools for 3D creation.
FreeCAD - An open-source parametric 3D modeler
Keyshot - KeyShot 3D rendering and animation software is the fastest, easiest way to create amazing, photographic visuals of your 3D models. Enter your search in the box aboveTryYour download of KeyShot is only moments away.
SketchUp - 3D for Everyone
Unity - The multiplatform game creation tools for everyone.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.