Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
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.
Invision - Prototyping and collaboration for design teams
Boxy SVG - Boxy SVG is a vector graphic editor built for the modern web.