Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
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.
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.
AutoDraw - A Google Experiment that helps you draw with relevant suggestions.