OpenSCAD - OpenSCAD is a software for creating solid 3D CAD objects.
Unity - The multiplatform game creation tools for everyone.
OpenJSCAD.org - OpenSCAD + JavaScript = OpenJSCAD, edit locally or remote online, preview in browser direct via...
Godot Engine - Feature-packed 2D and 3D open source game engine.
ImplicitCAD - ImplicitCAD is a programmatic CAD program, implemented in Haskell.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.