Invision - Prototyping and collaboration for design teams
Vectr - Free vector graphics editor. A simple yet powerful web and desktop cross-platform tool for everyone.
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
Vecteezy Editor - Free Online Vector Editor - Design and customize SVG illustrations and graphics quickly and easily in your browser.
Craftwork - A collection of User Interface resources made by Craftwork
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.