Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Invision - Prototyping and collaboration for design teams
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.
Webflow - Build dynamic, responsive websites in your browser. Launch with a click. Or export your squeaky-clean code to host wherever you'd like. Discover the professional website builder made for designers.
AutoDraw - A Google Experiment that helps you draw with relevant suggestions.