Sketch - Professional digital design for Mac.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Affinity Designer - Professional creative software, exclusively for Mac.
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
Vectr - Free vector graphics editor. A simple yet powerful web and desktop cross-platform tool for everyone.