Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Sketch - Professional digital design for Mac.
Adobe Illustrator CC - Adobe Illustrator CC is a commercial vector graphics editor.
Boxy SVG - Boxy SVG is a vector graphic editor built for the modern web.
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
AutoDraw - A Google Experiment that helps you draw with relevant suggestions.