SketchUp - 3D for Everyone
Unity - The multiplatform game creation tools for everyone.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
Godot Engine - Feature-packed 2D and 3D open source game engine.
DraftSight - Discover Dassault Systèmes®' DRAFTSIGHT™ Professional CAD software that lets you create, edit, view and markup any kind of 2D drawing. Learn more here.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.