Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Vectr - Free vector graphics editor. A simple yet powerful web and desktop cross-platform tool for everyone.
Invision - Prototyping and collaboration for design teams
Vecteezy Editor - Free Online Vector Editor - Design and customize SVG illustrations and graphics quickly and easily in your browser.
Sketch - Professional digital design for Mac.
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.