Unity - The multiplatform game creation tools for everyone.
FreeCAD - An open-source parametric 3D modeler
Godot Engine - Feature-packed 2D and 3D open source game engine.
MakerSCAD - Powerfull 3D design tool for 3D printing, virtual reality and game engine.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
DynaMaker - Cloud service for Visual Product Configuration with parametric geometry and CAD / BIM