Sketch - Professional digital design for Mac.
Sken.io - The most advanced tools for tracking changes on websites.
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Affinity Designer - Professional creative software, exclusively for Mac.
Finch for Windows - Make visual changes to any website. Immediately.