FreeCAD - An open-source parametric 3D modeler
Unity - The multiplatform game creation tools for everyone.
OpenSCAD - OpenSCAD is a software for creating solid 3D CAD objects.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Autodesk AutoCAD - Autodesk AutoCAD is a commercial computer-aided design (CAD) and drafting software application.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.