Unity - The multiplatform game creation tools for everyone.
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Adobe Illustrator CC - Adobe Illustrator CC is a commercial vector graphics editor.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Boxy SVG - Boxy SVG is a vector graphic editor built for the modern web.